| Achievement | Unlocked | Visibility | Global Unlocks | |
|---|---|---|---|---|
|
The Rarest Specimen
Carry the Hidden Hat to Endgame. |
2020-05-04 11:57:40 | 1.8% | ||
|
Less Than Desirable Consequences
Die in the AMS Beam before starting the experiment. |
2020-05-03 13:10:05 | 14.0% | ||
|
Rare Specimen
Send the Hidden Hat to Xen. |
2020-05-03 13:04:26 | 2.8% | ||
|
Limitless Potential
Accept G-Man’s offer of employment. |
2020-05-03 12:33:58 | 23.6% | ||
|
Rather an Anticlimax
Decline G-Man’s offer of employment. |
2020-05-03 12:33:42 | 15.4% | ||
|
Specimen GG
Take out all three Healing Crystals in Nihilanth’s Chamber at the same time. |
2020-05-03 12:28:03 | 2.8% | ||
|
Late for Work
Defeat Nihilanth in under 4 minutes. |
2020-05-03 12:26:19 | 2.9% | ||
|
Laser Immunization
Complete Interloper without taking any laser damage. |
2020-05-03 11:59:34 | 2.2% | ||
|
PhD in Pacifism
Don't kill any Vortigaunts in the Borderworld. |
2020-05-03 11:59:34 | 11.0% | ||
|
Black Mesa Decathlon Winner
Escape the Gargantua’s Lair without taking any damage from Gargantuas. |
2020-05-03 11:02:52 | 3.2% | ||
|
Contest Propellant
Find the snack supply canister. |
2020-05-03 10:52:06 | 10.1% | ||
|
Doctor’s Signature
Deliver the finishing blow to Gonarch with your Crowbar. |
2020-05-03 10:40:37 | 3.0% | ||
|
Unquestionably Ethical
Don't use the Cyanogen and let the Gonarch live. |
2020-05-03 10:32:59 | 2.0% | ||
|
The Plan
Use Cyanogen to kill Gonarch. |
2020-05-03 10:31:12 | 2.2% | ||
|
Gonad Glider
Get whacked into oblivion in the ledge fight. |
2020-05-03 10:02:30 | 5.5% | ||
|
Following the Rules
Use the welcome mat. |
2020-04-30 16:37:52 | 3.5% | ||
|
Orbital Trajectory
Skip the opening Xen island with a secret jump. |
2020-04-30 16:31:46 | 3.5% | ||
|
xen when
Wait too long to jump into the Lambda Teleporter. |
2020-04-30 16:27:42 | 3.8% | ||
|
Stealth Technology
Escape the Hangar in Surface Tension without alerting the Soldiers. |
2020-03-10 18:08:29 | 10.1% | ||
|
Well-Done
Cook a Grenade for too long. |
2020-03-07 21:20:59 | 17.6% | ||
|
One Step Ahead
Kill 10 Enemies with Tripmines. |
2020-03-06 21:00:23 | 5.8% | ||
|
Our Brains And Your Brawn
Assemble all the possible Scientists and Guards at the end of Office Complex. |
2020-03-06 16:35:08 | 4.8% | ||
|
Permeable Infrastructure
Use the alternate path in Office Complex. |
2019-10-02 22:23:20 | 24.1% | ||
|
Kinetic Repulsion
Kill a Marine with their own Grenade. |
2019-05-03 14:55:26 | 6.0% | ||
|
Mega Hertz
Kill 5 Enemies with one Grenade. |
2019-05-03 14:45:06 | 18.9% | ||
|
Futile Resistance
Kill 10 Enemies with Snarks. |
2019-05-01 18:23:42 | 7.2% | ||
|
Unified Coupling Theorum
Help the Barnacle and Headcrab find true love. |
2019-04-30 22:51:13 | 6.4% | ||
|
Remote Detonation
Kill a Barnacle with a Satchel. |
2019-04-28 14:55:44 | 11.5% | ||
|
Inflammatory Actions
Kill a Headcrab using fire. |
2019-04-25 11:37:58 | 25.5% | ||
|
Resonance Procrastinator
Refuse to insert the specimen into the Anti-Mass Spectrometer. |
2018-07-08 13:17:58 | 9.8% | ||
|
Hyper Saturation Conundrum
Drown in Lambda Core's coolant. |
2017-08-27 11:17:20 | 6.3% | ||
|
Premature Expulsion
Use an entire clip of Gluon ammo in one continuous shot. |
2017-08-27 11:11:39 | 26.3% | ||
|
Centripetal Attraction
Kill 20 Enemies with the Hivehand. |
2017-08-26 21:45:44 | 24.2% | ||
|
Digital Wizardry
Kill 10 enemies with a reprogrammed Sentry. |
2017-08-26 21:44:56 | 9.3% | ||
|
Nuclear Fishin'
Kill an Ichthyosaur with either the Tau or Gluon. |
2017-08-26 21:29:24 | 12.4% | ||
|
Prophylactic Suggested
Get overtaken by a Headcrab's ample anterior. |
2017-08-25 14:23:20 | 34.4% | ||
|
Calculated Trajectory
Kill 10 airborne Headcrabs using the Shotgun. |
2017-08-25 14:00:51 | 14.0% | ||
|
Quantum Capacitance
Overcharge it anyway. |
2017-08-21 21:09:16 | 19.7% | ||
|
Ethically Questionable
Conduct all of the questionable research experiments. |
2017-08-15 17:38:25 | 5.6% | ||
|
Universal Gravitation
Get killed by your own Snarks. |
2017-08-15 14:11:09 | 11.1% | ||
|
Dead Reckoning
Kill an Assassin with the .357 Magnum. |
2017-08-05 16:14:24 | 23.3% | ||
|
Gray Matter Propulsion
Headshot 20 Enemies with the .357 Magnum. |
2017-07-15 13:44:29 | 38.7% | ||
|
Caffeine Extraction
Perform surgical caffeine extraction from 20 vending machines. |
2017-07-15 13:28:10 | 22.9% | ||
|
Brownian Motion
Pass the toilet paper to the Scientist in need. |
2017-07-13 22:17:14 | 62.5% | ||
|
Convection Refinement
Ruin the microwave casserole. |
2017-07-13 18:23:04 | 51.2% | ||
|
Proverbial Tinkerer
Interfere with the alarm and laptop in Anomalous Materials. |
2017-07-13 18:19:21 | 17.0% | ||
|
Anti-Matter Over Mind
Kill a Controller without killing any of its mind-controlled Vortigaunt slaves. |
26.4% | |||
|
Pepperoni Precipitation
View the *other* secret ending. |
1.6% | |||
|
Post-Mortem Interval
Find each member of the missing research teams. |
1.8% | |||
|
Prolific Popper
Kill all Protozoans in the Borderworld. |
1.7% |