Achievement Unlocked Visibility Global Unlocks
Pepperoni Precipitation
View the *other* secret ending. 		2024-04-25 18:18:27
1.7%
The Rarest Specimen
Carry the Hidden Hat to Endgame. 		2024-04-25 18:08:15
1.8%
Rare Specimen
Send the Hidden Hat to Xen. 		2024-04-25 17:37:14 2.8%
Limitless Potential
Accept G-Man’s offer of employment. 		2024-04-25 01:32:54 23.9%
Rather an Anticlimax
Decline G-Man’s offer of employment. 		2024-04-25 01:32:02 15.6%
Late for Work
Defeat Nihilanth in under 4 minutes.​ 		2024-04-25 01:28:42 2.9%
Specimen GG
Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​. 		2024-04-25 01:27:28 2.9%
Prolific Popper
Kill all Protozoans in the Borderworld. 		2024-04-25 01:14:20 1.7%
Laser Immunization
Complete Interloper without taking any laser damage. 		2024-04-25 00:56:40 2.2%
PhD in Pacifism
Don't kill any Vortigaunts in the Borderworld. 		2024-04-25 00:56:40 11.2%
Black Mesa Decathlon Winner
Escape the Gargantua’s Lair without taking any damage from Gargantuas. 		2024-04-24 22:49:25 3.3%
Contest Propellant
Find the snack supply canister. 		2024-04-24 22:10:46
10.3%
Anti-Matter Over Mind
Kill a Controller without killing any of its mind-controlled Vortigaunt slaves. 		2024-04-24 22:08:02 26.6%
Unquestionably Ethical
Don't use the Cyanogen and let the Gonarch live. 		2024-04-24 21:34:01
2.1%
Doctor’s Signature
Deliver the finishing blow to Gonarch with your Crowbar. 		2024-04-24 21:32:39 3.0%
Post-Mortem Interval
Find each member of the missing research teams. 		2024-04-24 21:14:02 1.8%
The Plan
Use Cyanogen to kill Gonarch. 		2024-04-24 21:11:20
2.3%
Gonad Glider
Get whacked into oblivion in the ledge fight. 		2024-04-23 22:56:25 5.6%
Following the Rules
Use the welcome mat. 		2024-04-23 01:19:12
3.6%
Orbital Trajectory
Skip the opening Xen island with a secret jump.​ 		2024-04-23 01:08:41 3.6%
xen when
Wait too long to jump into the Lambda Teleporter. 		2024-04-23 01:03:34
3.9%
Hyper Saturation Conundrum
Drown in Lambda Core's coolant. 		2024-04-23 00:07:03 6.3%
Premature Expulsion
Use an entire clip of Gluon ammo in one continuous shot. 		2024-04-23 00:04:17 26.5%
Nuclear Fishin'
Kill an Ichthyosaur with either the Tau or Gluon. 		2024-04-22 23:31:32 12.5%
Stealth Technology
Escape the Hangar in Surface Tension without alerting the Soldiers. 		2024-04-22 23:15:55 10.2%
Centripetal Attraction
Kill 20 Enemies with the Hivehand. 		2024-04-22 22:18:58 24.2%
Quantum Capacitance
Overcharge it anyway. 		2024-04-20 22:45:40 19.7%
Ethically Questionable
Conduct all of the questionable research experiments. 		2024-04-20 22:43:29 5.6%
Futile Resistance
Kill 10 Enemies with Snarks. 		2024-04-20 22:39:09 7.3%
Universal Gravitation
Get killed by your own Snarks. 		2024-04-20 22:32:59 11.1%
Dead Reckoning
Kill an Assassin with the .357 Magnum. 		2024-04-20 20:38:26 23.4%
One Step Ahead
Kill 10 Enemies with Tripmines​​. 		2024-04-17 23:05:51 5.8%
Gray Matter Propulsion
Headshot 20 Enemies with the .357 Magnum. 		2024-04-17 22:51:16 38.8%
Remote Detonation
Kill a Barnacle with a Satchel. 		2024-04-17 22:09:46 11.5%
Unified Coupling Theorum
Help the Barnacle and Headcrab find true love. 		2024-04-16 22:58:52 6.4%
Mega Hertz
Kill 5 Enemies with one Grenade. 		2024-04-16 22:53:57 19.0%
Kinetic Repulsion
Kill a Marine with their own Grenade. 		2024-04-16 22:43:22 6.1%
Digital Wizardry
Kill 10 enemies with a reprogrammed Sentry. 		2024-04-16 22:32:58 9.3%
Permeable Infrastructure
Use the alternate path in Office Complex. 		2024-04-16 22:28:06 24.1%
Our Brains And Your Brawn
Assemble all the possible Scientists and Guards at the end of Office Complex. 		2024-04-16 22:04:08 4.8%
Well-Done
Cook a Grenade for too long. 		2024-04-16 21:34:43 17.7%
Calculated Trajectory
Kill 10 airborne Headcrabs using the Shotgun. 		2024-04-16 21:32:33 14.0%
Prophylactic Suggested
Get overtaken by a Headcrab's ample anterior. 		2024-04-16 00:07:07 34.5%
Inflammatory Actions
Kill a Headcrab using fire. 		2024-04-15 23:58:48 25.7%
Caffeine Extraction
Perform surgical caffeine extraction from 20 vending machines. 		2024-04-15 23:40:26 22.9%
Less Than Desirable Consequences
Die in the AMS Beam before starting the experiment. 		2024-04-15 23:26:42 14.2%
Resonance Procrastinator
Refuse to insert the specimen into the Anti-Mass Spectrometer. 		2024-04-15 23:24:14 9.8%
Convection Refinement
Ruin the microwave casserole. 		2024-04-15 23:05:03 51.2%
Brownian Motion
Pass the toilet paper to the Scientist in need. 		2024-04-15 23:04:23 62.5%
Proverbial Tinkerer
Interfere with the alarm and laptop in Anomalous Materials. 		2024-04-15 22:59:18 17.1%