Achievement Unlocked Game Visibility Global Unlocks
SCAVENGE HUNT
Stop the enemy team from collecting any gas cans during a Scavenge round. 		2010-11-07 19:09:52
Left 4 Dead 2 5.4%
MEAT TENDERIZER
As the Charger, grab a Survivor and smash them into the ground for a solid 15 seconds. 		2010-11-07 19:08:52
Left 4 Dead 2 13.4%
QUALIFIED RIDE
As the Jockey, ride a Survivor for more than 12 seconds. 		2010-11-07 19:06:00
Left 4 Dead 2 15.9%
SUPREME SACRIFICE
Complete "The Sacrifice". 		2010-11-07 15:50:57
Left 4 Dead 2 20.5%
ARMORY OF ONE
Deploy an ammo upgrade and have your team use it. 		2010-11-07 15:45:21
Left 4 Dead 2 51.6%
PRICE CHOPPER
Survive the Dead Center campaign. 		2010-11-07 14:25:47
Left 4 Dead 2 40.0%
Escape From City 17
Escape City 17 with Alyx. 		2010-10-08 17:19:18
Half-Life 2: Episode One 48.1%
Citizen Escort
Don't let any citizens die when escorting them to the escape train. 		2010-10-08 17:10:48
Half-Life 2: Episode One 31.8%
Attica!
Destroy the gunship in the hospital attic. 		2010-10-08 16:37:13
Half-Life 2: Episode One 50.8%
Car Crusher
Use the cars to squash 15 antlions in Episode One. 		2010-10-08 16:14:08
Half-Life 2: Episode One 15.4%
Elevator Action
Survive long enough to get on the parking garage elevator. 		2010-10-08 15:46:55
Half-Life 2: Episode One 53.6%
Containment
Contain the Citadel core. 		2010-10-07 17:13:43
Half-Life 2: Episode One 59.8%
Watch Your Head!
Make it to the bottom of the Citadel's main elevator shaft in one piece. 		2010-10-07 16:55:03
Half-Life 2: Episode One 62.1%
Freezer Burn
Provide enemies with freezecam shots of each of your taunts. 		2010-10-07 12:03:41
Team Fortress 2 10.9%
The Last Wave
Provide an enemy with a freezecam shot of you waving to them. 		2010-10-07 11:53:55
Team Fortress 2 12.2%
Be Efficient
Get 3 kills with the Sniper Rifle without missing a shot. 		2010-10-07 11:52:40
Team Fortress 2 25.0%
Sentry Gunner
Accumulate 10 sentry gun kills with a single sentry. 		2010-10-07 11:48:13
Team Fortress 2 16.4%
Uncivil Engineer
Provide an enemy player with a freezecam of you and the sentry that just killed them. 		2010-10-07 11:48:00
Team Fortress 2 23.5%
OMGWTFBBQ
Kill an enemy with a taunt. 		2010-10-06 21:43:38
Team Fortress 2 12.8%
Burn Notice
Survive 30 seconds after being ignited while cloaked. 		2010-10-06 21:42:13
Team Fortress 2 20.3%
Spy Milestone 1
Achieve 5 of the achievements in the Spy pack. 		2010-10-06 21:27:38
Team Fortress 2 20.1%
May I Cut In?
Backstab an enemy and the Medic healing him within 10 seconds of each other. 		2010-10-06 21:27:37
Team Fortress 2 12.7%
FYI I am a Spy
Backstab a Medic who has healed you in the last 5 seconds. 		2010-10-06 20:58:19
Team Fortress 2 13.0%
Dr. Nooooo
Backstab a Medic that is ready to deploy an ÜberCharge. 		2010-10-06 20:58:19
Team Fortress 2 14.6%
Identity Theft
Backstab the enemy that you're currently disguised as. 		2010-10-06 20:52:08
Team Fortress 2 18.8%
You Only Shiv Thrice
Backstab 3 enemies within 10 seconds. 		2010-10-06 20:33:07
Team Fortress 2 20.0%
Baptism by Fire
Force 10 burning enemies to jump into water. 		2010-10-06 20:19:19
Team Fortress 2 12.6%
Pyro Milestone 2
Achieve 16 of the achievements in the Pyro pack. 		2010-10-06 20:19:19
Team Fortress 2 15.5%
Doc Holiday
Have a dispenser heal 3 teammates at the same time. 		2010-10-06 19:40:40
Team Fortress 2 26.5%
Dynasty
Win 20 games. 		2010-10-06 19:13:30
Team Fortress 2 20.8%
I Fry
Ignite 10 disguised Spies. 		2010-10-05 20:19:44
Team Fortress 2 18.1%
Spontaneous Combustion
Ignite 10 cloaked Spies. 		2010-07-20 15:20:45
Team Fortress 2 17.8%
Close Encounters
Kill 20 Swarm with melee attacks in a single mission. 		2010-07-20 14:08:58
Alien Swarm 32.7%
Normal Campaign
Complete the Jacob's Rest campaign on Normal difficulty or harder. 		2010-07-20 13:56:39
Alien Swarm 26.2%
Easy Campaign
Complete the Jacob's Rest campaign on Easy difficulty or harder. 		2010-07-20 13:56:39
Alien Swarm 29.9%
Pyrotechnician
Kill 250 Swarm with a Flamethrower. 		2010-07-20 13:56:14
Alien Swarm 23.7%
On the Ready Line
Kill 1,000 Swarm. 		2010-07-20 13:32:06
Alien Swarm 32.3%
Gunslinger
Successfully perform 5 fast reloads in a row. 		2010-07-20 13:09:14
Alien Swarm 23.9%
Zero Mortality
Complete a mission on Normal difficulty or harder without any marines dying. 		2010-07-20 13:02:48
Alien Swarm 37.1%
Stay Frosty
Freeze 6 Swarm with a single Freeze Grenade. 		2010-07-20 10:01:33
Alien Swarm 20.2%
Damage Amped
Kill 15 Swarm with all four marines under the effects of a Damage Amp in a single mission. 		2010-07-20 09:50:43
Alien Swarm 18.9%
Under the Gun
Roll under a Swarm Ranger projectile. 		2010-07-20 09:35:51
Alien Swarm 35.8%
Seal of Quality
Seal a door with the welder. 		2010-07-20 09:18:55
Alien Swarm 39.1%
Race for the Pennant
Run 25 kilometers. 		2010-07-20 00:11:57
Team Fortress 2 51.4%
Prototype Professional
Kill 250 Swarm with a Prototype Rifle. 		2010-07-19 23:29:53
Alien Swarm 23.7%
Parasite Puncher
Kill a Swarm Parasite with a melee attack. 		2010-07-19 23:06:34
Alien Swarm 28.0%
Quick and Dead
Kill a Swarm Boomer before it inflates. 		2010-07-19 22:50:25
Alien Swarm 48.0%
Shield Down
Deliver the finishing blow to a Swarm Shieldbug. 		2010-07-19 22:43:41
Alien Swarm 43.8%
Electro-Stunned
Stun 6 Swarm with a single Stun Grenade. 		2010-07-19 22:38:04
Alien Swarm 23.2%
Hat Trick
Complete 2 co-op missions online. Earns a Team Fortress 2 parasite hat. 		2010-07-19 22:26:40
Alien Swarm 55.7%
Technician Secured
Finish a mission without the tech getting killed. 		2010-07-19 22:18:46
Alien Swarm 56.2%
Protect the Tech
Guard the squad's tech so that he takes no damage during the hack. 		2010-07-19 22:18:06
Alien Swarm 41.7%
Clear Firing
Kill 25 drones without friendly fire. Four marines must be present in the mission. 		2010-07-19 22:16:48
Alien Swarm 34.8%
Quick Load
Successfully perform a fast reload. 		2010-07-19 22:15:04
Alien Swarm 40.8%
Map Loader
Play 20 different maps 		2010-07-10 02:11:41
Garry's Mod 40.5%
Singularity Collapse
Destroy the Citadel's reactor core. 		2010-07-08 23:10:06
Half-Life 2
27.2%
Atomizer
Disintegrate 15 soldiers by throwing them into a Combine ball field. 		2010-07-01 18:45:29
Half-Life 2 13.2%
Giant Killer
Survive the rooftop strider battle in the ruins of City 17. 		2010-07-01 18:31:58
Half-Life 2 27.8%
Fight the Power
Shut down the supression device by disabling its generators. 		2010-07-01 17:53:25
Half-Life 2 28.9%
Plaza Defender
Survive the generator plaza standoff in chapter Anticitizen One. 		2010-07-01 17:12:15
Half-Life 2 30.4%
Radiation Levels Detected
Get through the toxic tunnel under City 17 in Half-Life 2. 		2010-07-01 16:53:48
Half-Life 2 31.0%
Follow Freeman
Gain command of a squad of rebels in the uprising. 		2010-06-30 13:56:37
Half-Life 2 31.7%
Warden Freeman
Survive the second turret standoff in Nova Prospekt. 		2010-06-30 13:36:42
Half-Life 2 31.8%
One Man Army
Destroy six gunships in Half-Life 2. 		2010-06-30 10:43:06
Half-Life 2 28.9%
Bug Hunt
Use the antlions to kill 50 enemies. 		2010-06-30 10:37:55
Half-Life 2 32.7%
Targetted Advertising
Pin a soldier to the billboard in chapter Highway 17. 		2010-06-29 17:35:53
Half-Life 2 17.5%
OSHA Violation
Kill 3 enemies using the crane. 		2010-06-29 17:23:07
Half-Life 2 22.7%
Where Cubbage Fears to Tread
Defend Little Odessa from the gunship attack. 		2010-06-29 17:16:26
Half-Life 2
38.3%
Hallowed Ground
Escort Gregori safely through the church cemetery. 		2010-06-29 16:50:25
Half-Life 2
39.7%
Dead Man Stalking
Kill an enemy while at 1 health 		2010-06-28 13:23:58
Counter-Strike: Source 41.1%
Two Points
Use DOG's ball to make a basket in Eli's scrapyard. 		2010-06-28 12:19:37
Half-Life 2 9.7%
Zero-Point Energy
Get the Gravity Gun in Black Mesa East. 		2010-06-28 12:15:23
Half-Life 2 44.1%
Blast from the Past
Find the HEV Suit Charger faceplate in Eli's scrapyard. 		2010-06-28 12:14:44
Half-Life 2 22.9%
Revenge!
Destroy the hunter-chopper in Half-Life 2. 		2010-06-28 12:00:52
Half-Life 2 45.0%
Heavy Weapons
Get the airboat's mounted gun. 		2010-06-28 11:49:16
Half-Life 2 47.2%
Make the Cut
Win a knife fight 		2010-06-27 19:43:50
Counter-Strike: Source 37.6%
Anchor's Aweigh!
Get the airboat. 		2010-06-27 18:53:12
Half-Life 2 53.2%
Barnacle Bowling
Kill five barnacles with one barrel. 		2010-06-27 17:50:31
Half-Life 2 36.9%
Trusty Hardware
Get the crowbar. 		2010-06-27 17:37:33
Half-Life 2 67.0%
What cat?
Break the mini-teleporter in Kleiner's lab. 		2010-06-27 17:29:37
Half-Life 2 12.7%
Malcontent
Escape the apartment block raid. 		2010-06-27 17:24:23
Half-Life 2 69.6%
Submissive
Put the can in the trash. 		2010-06-27 17:17:59
Half-Life 2
44.7%
Defiant
Hit the trashcan cop with the can. 		2010-06-27 17:12:52
Half-Life 2
32.5%
Safety First
Survive a shot to the head because you had the good sense to wear a helmet 		2010-06-26 14:30:16
Counter-Strike: Source 46.7%
Finishing Schooled
Kill an enemy player who has been reduced to less than 5% health by other players 		2010-06-26 14:24:35
Counter-Strike: Source 55.4%
Magic Bullet
Kill an enemy with the last bullet in your magazine (excluding sniper rifles) 		2010-06-26 14:17:46
Counter-Strike: Source 53.0%
Overkill
Kill an opponent you are already dominating 		2010-06-26 11:46:09
Counter-Strike: Source 52.1%
Repeat Offender
Dominate an enemy player 		2010-06-26 11:44:49
Counter-Strike: Source 56.9%
Blast Will and Testament
Win a round by picking up the bomb from a fallen comrade and successfully planting it 		2010-06-25 23:53:11
Counter-Strike: Source 17.6%
Shot With Their Pants Down
Kill an enemy player while they are reloading 		2010-06-25 23:16:31
Counter-Strike: Source 62.4%
Someone Set Up Us The Bomb
Win a round by planting a bomb 		2010-06-25 23:14:24
Counter-Strike: Source 38.5%
Body Bagger
Kill 25 enemies 		2010-06-25 23:14:15
Counter-Strike: Source 59.7%
War Bonds
Earn $125,000 total cash 		2010-06-25 22:55:59
Counter-Strike: Source 58.6%
Blind Fury
Kill an enemy player while you are blinded from a flashbang 		2010-06-25 22:48:42
Counter-Strike: Source 44.3%
Points in Your Favor
Inflict 2,500 total points of damage to enemy players 		2010-06-25 22:45:50
Counter-Strike: Source 62.7%
Primer
Do at least 95% damage to an enemy who is then killed by a another player 		2010-06-25 22:38:54
Counter-Strike: Source 53.8%
Clean Sweep
Kill the entire opposing team without any members of your team taking any damage 		2010-06-25 22:27:52
Counter-Strike: Source 20.4%
Mercy Rule
Kill the entire opposing team without any members of your team dying 		2010-06-25 22:27:52
Counter-Strike: Source 45.3%
Newb World Order
Win 10 rounds 		2010-06-25 22:27:52
Counter-Strike: Source 61.0%
Blitzkrieg
Win a round in less than 30 seconds (against at least 5 enemy players) 		2010-06-25 22:19:58
Counter-Strike: Source 43.9%
Vanilla Crazy Cake
Beat all six Portal advanced maps. 		2010-06-24 18:31:09
Portal 9.0%
Fruitcake
Beat four Portal advanced maps. 		2009-12-16 17:22:27
Portal 11.9%
Desperado
Kill 5 enemies in a row using 5 different weapons or attachments in Single Player or Special Ops. 		2009-12-09 20:06:44
Call of Duty: Modern Warfare 2 (2009) 21.5%
Turistas
Complete 'Takedown' and 'The Hornet's Nest' on Veteran Difficulty. 		2009-12-01 17:56:47
Call of Duty: Modern Warfare 2 (2009) 9.7%
Black Diamond
Complete 'Cliffhanger' on Veteran Difficulty. 		2009-11-26 20:09:21
Call of Duty: Modern Warfare 2 (2009) 14.2%
First Day of School
Complete 'S.S.D.D.' and 'Team Player' on Veteran Difficulty. 		2009-11-26 19:51:50
Call of Duty: Modern Warfare 2 (2009) 13.0%
PPM 30,000
30000 points per minute. 3 minute minimum. 		2009-11-26 17:23:31
Audiosurf 31.1%
Olympian
Earn triple a gold medal requirement. 2 min minimum. 		2009-11-26 17:23:31
Audiosurf 68.5%
The Price of War
Complete the single player campaign on Hardened or Veteran Difficulty. 		2009-11-17 19:02:26
Call of Duty: Modern Warfare 2 (2009) 14.9%
For the Record
Complete the Single Player campaign on any difficulty. 		2009-11-17 19:02:26
Call of Duty: Modern Warfare 2 (2009) 48.5%
Out of the Frying Pan…
Complete the mission in the airplane graveyard. 		2009-11-17 19:02:26
Call of Duty: Modern Warfare 2 (2009) 43.2%
The Pawn
Assault Makarov's safe house. 		2009-11-17 18:22:15
Call of Duty: Modern Warfare 2 (2009) 41.7%
Whiskey Hotel
Take back Whiskey Hotel. 		2009-11-17 18:22:15
Call of Duty: Modern Warfare 2 (2009) 44.3%
Desperate Times
Execute the plan to help the Americans. 		2009-11-17 17:58:05
Call of Duty: Modern Warfare 2 (2009) 45.6%
Soap on a Rope
Storm the gulag. 		2009-11-16 23:15:56
Call of Duty: Modern Warfare 2 (2009) 49.1%
Unnecessary Roughness
Use a riot shield to beat down an enemy in Single Player or Special Ops. 		2009-11-16 23:00:39
Call of Duty: Modern Warfare 2 (2009) 46.1%
The Harder They Fall
Kill 2 rappelling enemies in a row before they land on their feet in Single Player or Special Ops. 		2009-11-16 13:05:28
Call of Duty: Modern Warfare 2 (2009) 49.7%
Blackjack
Earn 21 stars in Special Ops. 		2009-11-15 22:57:29
Call of Duty: Modern Warfare 2 (2009) 22.8%
It Goes to Eleven
Earn at least 1 star in 11 different Special Op missions. 		2009-11-15 22:57:29
Call of Duty: Modern Warfare 2 (2009) 24.1%
Some Like it Hot
Kill 6 enemies in a row using a thermal weapon in Single Player or Special Ops. 		2009-11-15 14:14:09
Call of Duty: Modern Warfare 2 (2009) 56.4%
Ten plus foot-mobiles
Kill at least 10 enemies with one Predator missile in Single Player or Special Ops. 		2009-11-15 14:14:09
Call of Duty: Modern Warfare 2 (2009) 60.9%
Royale with Cheese
Defend Burger Town. 		2009-11-15 14:03:36
Call of Duty: Modern Warfare 2 (2009) 58.5%
Tag 'em and bag 'em
Find Rojas in the Favelas. 		2009-11-15 14:03:36
Call of Duty: Modern Warfare 2 (2009) 56.3%
Cold Shoulder
Infiltrate the snowy mountain side base. 		2009-11-15 13:07:47
Call of Duty: Modern Warfare 2 (2009) 62.6%
Danger Close
Get hand picked for Shepherd's elite squad. 		2009-11-15 13:07:47
Call of Duty: Modern Warfare 2 (2009) 62.1%
Three-some
Kill at least 3 enemies with a single shot from a grenade launcher in Single Player or Special Ops. 		2009-11-15 12:56:53
Call of Duty: Modern Warfare 2 (2009) 66.7%
Back in the Saddle
Help train the local militia. 		2009-11-15 12:54:33
Call of Duty: Modern Warfare 2 (2009) 65.7%
Charlie On Our Six
Earn 8 stars in Special Ops. 		2009-11-14 20:15:23
Call of Duty: Modern Warfare 2 (2009) 38.0%
Hotel Bravo
Earn 4 stars in Special Ops. 		2009-11-14 16:05:54
Call of Duty: Modern Warfare 2 (2009) 41.4%
Two Birds with One Stone
Kill 2 enemies with a single bullet in Single Player or Special Ops. 		2009-11-14 16:03:40
Call of Duty: Modern Warfare 2 (2009) 71.4%
Gold Star
Earn 1 star in Special Ops. 		2009-11-14 15:54:08
Call of Duty: Modern Warfare 2 (2009) 54.6%
Play Around
Play a gamemode that isn't sandbox 		2009-09-16 16:30:13
Garry's Mod 78.8%
Play Multiplayer
Play multiplayer at least once 		2009-09-16 16:30:13
Garry's Mod 86.6%
Secret Phrase
Say the secret phrase 		2009-09-15 17:00:00
Garry's Mod 6.8%
Play Singleplayer
Play singleplayer at least once 		2009-09-15 17:00:00
Garry's Mod 78.4%
Don't Tread on Me
Block a Flag Capture that would have won the round for the enemy team 		Unlocked
Day of Defeat: Source 15.9%
Don't Bring a Gun
Win a knife fight 		Unlocked
Day of Defeat: Source 19.7%
Beachhead
Capture the final flag to win a round 		Unlocked
Day of Defeat: Source 22.8%
Makin' Bacon
Kill 50 Heavies with your flamethrower. 		Unlocked
Team Fortress 2 8.4%
Triage
Deploy an ÜberCharge on a teammate less than a second before they're hit by a critical explosive. 		Unlocked
Team Fortress 2 10.2%
Clearcutter
Kill 6 people with your axe in one life. 		Unlocked
Team Fortress 2 11.0%
Big Pharma
Assist a Heavy in killing 10 enemies, where neither of you die. 		Unlocked
Team Fortress 2 11.3%
Pyrotechnics
Kill 3 enemies in a single ÜberCharge. 		Unlocked
Team Fortress 2 12.3%
Sawbones
Hit enemies with your bonesaw 5 times in a row without dying or missing. 		Unlocked
Team Fortress 2 11.6%
Show Trial
Kill an enemy with a taunt. 		Unlocked
Team Fortress 2 12.2%
Firefighter
Kill 500 enemies. 		Unlocked
Team Fortress 2 12.0%
Soviet Union
Get 25 enemy kills where you either assist or are assisted by another Heavy. 		Unlocked
Team Fortress 2 12.2%
Lumberjack
Kill 3 people with your axe in one life. 		Unlocked
Team Fortress 2 13.0%
Heavy Industry
Fire $200,000 worth of minigun rounds in a single life. 		Unlocked
Team Fortress 2 13.1%
Icing on the Cake
Get 20 kills on players that you're dominating. 		Unlocked
Team Fortress 2 12.2%
Hot on Your Heels
Kill 50 enemies with your flamethrower, from behind. 		Unlocked
Team Fortress 2 13.4%
Rationing
Kill an enemy with your shotgun while you're out of minigun ammo. 		Unlocked
Team Fortress 2 14.4%
Heavy Milestone 1
Achieve 10 of the achievements in the Heavy pack. 		Unlocked
Team Fortress 2 15.6%
Double Blind Trial
Deploy an ÜberCharge within 8 seconds of a nearby enemy Medic deploying his. 		Unlocked
Team Fortress 2 16.0%
Team Doctor
Accumulate 25000 heal points as a Medic. 		Unlocked
Team Fortress 2 15.4%
Trauma Queen
Deploy 3 ÜberCharges in less than 5 minutes, and assist in 5 kills during that time. 		Unlocked
Team Fortress 2 16.0%
Hardcore
Accumulate 1000 total kills. 		Unlocked
Team Fortress 2 15.8%
BarbeQueQ
Cause a dominated player to leave the server. 		Unlocked
Team Fortress 2 16.5%
Communist Mani-Fisto
Kill an enemy with a critical punch. 		Unlocked
Team Fortress 2 16.7%
Permanent Revolution
Kill 5 enemies without spinning down your gun. 		Unlocked
Team Fortress 2 16.2%
Pyro Milestone 1
Achieve 10 of the achievements in the Pyro pack. 		Unlocked
Team Fortress 2 18.0%
Midwife Crisis
Heal an Engineer as he repairs his sentry gun while it's under enemy fire. 		Unlocked
Team Fortress 2 18.0%
Quadruple Bypass
Heal a teammate who's taking fire from 4 enemies at once. 		Unlocked
Team Fortress 2 18.1%
Powerhouse Offense
Win 2Fort with a shutout. 		Unlocked
Team Fortress 2 20.4%
Surgical Prep
Have an ÜberCharge ready before the Setup phase ends. 		Unlocked
Team Fortress 2 20.2%
Bedside Manner
Be healing a teammate as he achieves an achievement of his own. 		Unlocked
Team Fortress 2 18.4%
Vanguard Party
Be the first on your team to start capturing a control point in a round. 		Unlocked
Team Fortress 2 18.5%
Weenie Roast
Have 2 enemy Scouts on fire at the same time. 		Unlocked
Team Fortress 2 22.4%
Master of Disguise
Trick an opposing Medic into healing you. 		Unlocked
Team Fortress 2 23.4%
Rasputin
In a single life, get shot, burned, bludgeoned, and receive explosive damage. 		Unlocked
Team Fortress 2 26.6%
Dead Heat
Kill an enemy in the same second that he kills you. 		Unlocked
Team Fortress 2 26.9%
Second Degree Burn
Kill a burning enemy who was ignited by another Pyro. 		Unlocked
Team Fortress 2 27.0%
Next of Kindling
Ignite an enemy, and the Medic healing him. 		Unlocked
Team Fortress 2 29.0%
Marxman
Kill 10 enemies in mid-air with the minigun. 		Unlocked
Team Fortress 2 26.7%
Flamethrower
Set five enemies on fire in 30 seconds. 		Unlocked
Team Fortress 2 29.5%
Nemesis
Get five revenge kills. 		Unlocked
Team Fortress 2 29.2%
Camp Fire
Kill 3 enemies in a row, all within the same area. 		Unlocked
Team Fortress 2 31.6%
Hard to Kill
Get five kills in a row without dying. 		Unlocked
Team Fortress 2 38.0%
Pedal to the Metal
Beat DOG in a race to the White Forest base. 		Unlocked
Half-Life 2: Episode Two 37.7%
Grave Robber
Steal a Zombine's grenade. 		Unlocked
Half-Life 2: Episode Two 37.3%
Hit and Run
Run over 20 enemies with the car in Episode Two. 		Unlocked
Half-Life 2: Episode Two 36.2%
Cache Checker
Find every radar cache in chapter Under The Radar. 		Unlocked
Half-Life 2: Episode Two 46.2%
Gordon Propelled Rocket
Unlock the rocket launcher lambda cache in chapter Under The Radar. 		Unlocked
Half-Life 2: Episode Two 59.9%
Defense of the Armament
Save the missile silo from the Combine offensive. 		Unlocked
Half-Life 2: Episode Two 61.3%
Deadly Harvest
Kill an enemy by planting a hopper mine. 		Unlocked
Half-Life 2: Episode Two 69.4%
Secondary Silo Secured
Secure the launch doors on missile silo 2. 		Unlocked
Half-Life 2: Episode Two 70.2%
Quiet Mountain Getaway
Survive the ambush at White Forest Inn. 		Unlocked
Half-Life 2: Episode Two 71.4%
Gunishment!
Destroy the Combine Autogun in the junkyard. 		Unlocked
Half-Life 2: Episode Two 72.4%
Meet the Hunters
Survive the Hunter ambush with Alyx. 		Unlocked
Half-Life 2: Episode Two 74.1%
Twofer
Defeat both antlion guards outside the White Forest. 		Unlocked
Half-Life 2: Episode Two 76.3%
Into the Breach
Help Griggs and Sheckley hold off the antlion invasion inside the mine shaft. 		Unlocked
Half-Life 2: Episode Two 83.3%
Acid Reflex
Kill an acid antlion worker. 		Unlocked
Half-Life 2: Episode Two 90.4%
PPM 10,000
10000 points per minute. 3 minute minimum. 		Unlocked
Audiosurf 76.7%
Royal Ride
Earn Gold without overfilling. 2 min minimum. 		Unlocked
Audiosurf 80.3%
Long Jump
Jump 300 feet. 		Unlocked
Portal 13.8%
Cupcake
Beat two Portal advanced maps. 		Unlocked
Portal 18.4%
Friendly Fire
Knock down a turret with another turret. 		Unlocked
Portal 49.2%
Heartbreaker
Complete Portal. 		Unlocked
Portal 52.5%
Partygoer
Make the correct party escort submission position decision. 		Unlocked
Portal 55.9%
Fratricide
Do whatever it takes to survive. 		Unlocked
Portal 63.8%
Lab Rat
Acquire the fully powered Aperture Science Handheld Portal Device. 		Unlocked
Portal 81.5%