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| Achievement | Unlocked | Visibility | Global Unlocks | |
|---|---|---|---|---|
|
Rather an Anticlimax
Decline G-Man’s offer of employment. |
2020-03-28 09:41:04 | 15.6% | ||
|
Limitless Potential
Accept G-Man’s offer of employment. |
2020-03-28 09:40:10 | 23.8% | ||
|
Pepperoni Precipitation
View the *other* secret ending. |
2020-03-28 09:36:15 | 1.7% | ||
|
The Rarest Specimen
Carry the Hidden Hat to Endgame. |
2020-03-28 09:36:15 | 1.8% | ||
|
Late for Work
Defeat Nihilanth in under 4 minutes. |
2020-03-28 09:34:44 | 2.9% | ||
|
Specimen GG
Take out all three Healing Crystals in Nihilanth’s Chamber at the same time. |
2020-03-28 09:33:19 | 2.9% | ||
|
Prolific Popper
Kill all Protozoans in the Borderworld. |
2020-03-28 09:30:52 | 1.7% | ||
|
Laser Immunization
Complete Interloper without taking any laser damage. |
2020-03-28 09:23:21 | 2.2% | ||
|
PhD in Pacifism
Don't kill any Vortigaunts in the Borderworld. |
2020-03-28 09:15:09 | 11.1% | ||
|
Black Mesa Decathlon Winner
Escape the Gargantua’s Lair without taking any damage from Gargantuas. |
2020-03-27 16:46:12 | 3.3% | ||
|
Contest Propellant
Find the snack supply canister. |
2020-03-27 16:34:22 | 10.2% | ||
|
Anti-Matter Over Mind
Kill a Controller without killing any of its mind-controlled Vortigaunt slaves. |
2020-03-27 16:33:25 | 26.6% | ||
|
Unquestionably Ethical
Don't use the Cyanogen and let the Gonarch live. |
2020-03-27 16:28:41 | 2.1% | ||
|
The Plan
Use Cyanogen to kill Gonarch. |
2020-03-27 16:26:43 | 2.2% | ||
|
Post-Mortem Interval
Find each member of the missing research teams. |
2020-03-27 16:26:43 | 1.8% | ||
|
Doctor’s Signature
Deliver the finishing blow to Gonarch with your Crowbar. |
2020-03-27 16:23:00 | 3.0% | ||
|
Gonad Glider
Get whacked into oblivion in the ledge fight. |
2020-03-27 15:54:14 | 5.6% | ||
|
Following the Rules
Use the welcome mat. |
2020-03-27 14:44:51 | 3.6% | ||
|
Orbital Trajectory
Skip the opening Xen island with a secret jump. |
2020-03-26 18:58:55 | 3.6% | ||
|
xen when
Wait too long to jump into the Lambda Teleporter. |
2020-03-26 18:53:06 | 3.9% | ||
|
Stealth Technology
Escape the Hangar in Surface Tension without alerting the Soldiers. |
2020-03-26 15:43:22 | 10.2% | ||
|
One Step Ahead
Kill 10 Enemies with Tripmines. |
2020-03-26 11:21:38 | 5.8% | ||
|
Our Brains And Your Brawn
Assemble all the possible Scientists and Guards at the end of Office Complex. |
2020-03-25 19:08:44 | 4.8% | ||
|
Well-Done
Cook a Grenade for too long. |
2020-03-25 17:24:05 | 17.7% | ||
|
Less Than Desirable Consequences
Die in the AMS Beam before starting the experiment. |
2020-03-25 16:51:51 | 14.2% | ||
|
Rare Specimen
Send the Hidden Hat to Xen. |
2015-06-23 17:38:04 | 2.8% | ||
|
Unified Coupling Theorum
Help the Barnacle and Headcrab find true love. |
2015-06-23 17:25:52 | 6.4% | ||
|
Futile Resistance
Kill 10 Enemies with Snarks. |
2015-06-23 17:21:39 | 7.2% | ||
|
Premature Expulsion
Use an entire clip of Gluon ammo in one continuous shot. |
2015-06-23 15:16:13 | 26.4% | ||
|
Hyper Saturation Conundrum
Drown in Lambda Core's coolant. |
2015-06-23 14:43:44 | 6.3% | ||
|
Centripetal Attraction
Kill 20 Enemies with the Hivehand. |
2015-06-23 13:48:35 | 24.2% | ||
|
Nuclear Fishin'
Kill an Ichthyosaur with either the Tau or Gluon. |
2015-06-22 21:43:23 | 12.5% | ||
|
Digital Wizardry
Kill 10 enemies with a reprogrammed Sentry. |
2015-06-22 21:36:58 | 9.3% | ||
|
Mega Hertz
Kill 5 Enemies with one Grenade. |
2015-06-22 21:25:20 | 19.0% | ||
|
Resonance Procrastinator
Refuse to insert the specimen into the Anti-Mass Spectrometer. |
2015-06-22 21:18:20 | 9.8% | ||
|
Kinetic Repulsion
Kill a Marine with their own Grenade. |
2015-06-22 21:02:24 | 6.0% | ||
|
Ethically Questionable
Conduct all of the questionable research experiments. |
2015-06-22 20:43:12 | 5.6% | ||
|
Quantum Capacitance
Overcharge it anyway. |
2015-06-22 20:39:13 | 19.7% | ||
|
Universal Gravitation
Get killed by your own Snarks. |
2015-06-22 20:31:14 | 11.1% | ||
|
Dead Reckoning
Kill an Assassin with the .357 Magnum. |
2015-06-22 19:22:56 | 23.4% | ||
|
Remote Detonation
Kill a Barnacle with a Satchel. |
2015-06-22 18:10:25 | 11.5% | ||
|
Calculated Trajectory
Kill 10 airborne Headcrabs using the Shotgun. |
2015-06-22 12:51:07 | 14.0% | ||
|
Gray Matter Propulsion
Headshot 20 Enemies with the .357 Magnum. |
2015-06-22 12:11:43 | 38.7% | ||
|
Prophylactic Suggested
Get overtaken by a Headcrab's ample anterior. |
2015-06-22 11:16:33 | 34.5% | ||
|
Permeable Infrastructure
Use the alternate path in Office Complex. |
2015-06-22 11:10:30 | 24.1% | ||
|
Inflammatory Actions
Kill a Headcrab using fire. |
2015-06-22 10:54:20 | 25.6% | ||
|
Caffeine Extraction
Perform surgical caffeine extraction from 20 vending machines. |
2015-06-21 22:30:31 | 22.9% | ||
|
Brownian Motion
Pass the toilet paper to the Scientist in need. |
2015-06-14 16:21:25 | 62.5% | ||
|
Convection Refinement
Ruin the microwave casserole. |
2015-06-14 16:19:36 | 51.2% | ||
|
Proverbial Tinkerer
Interfere with the alarm and laptop in Anomalous Materials. |
2015-06-14 00:30:17 | 17.1% |