| Achievement | Unlocked | Visibility | Global Unlocks | |
|---|---|---|---|---|
|
The Rarest Specimen
Carry the Hidden Hat to Endgame. |
2022-09-11 16:45:27 | 1.8% | ||
|
Pepperoni Precipitation
View the *other* secret ending. |
2022-09-11 16:40:35 | 1.6% | ||
|
Late for Work
Defeat Nihilanth in under 4 minutes. |
2022-09-11 16:39:26 | 2.9% | ||
|
Limitless Potential
Accept G-Man’s offer of employment. |
2022-09-11 16:10:54 | 23.8% | ||
|
Rather an Anticlimax
Decline G-Man’s offer of employment. |
2022-09-11 16:10:06 | 15.5% | ||
|
Specimen GG
Take out all three Healing Crystals in Nihilanth’s Chamber at the same time. |
2022-09-11 16:05:27 | 2.8% | ||
|
Prolific Popper
Kill all Protozoans in the Borderworld. |
2022-09-11 15:59:31 | 1.7% | ||
|
PhD in Pacifism
Don't kill any Vortigaunts in the Borderworld. |
2022-09-11 15:49:28 | 11.1% | ||
|
Contest Propellant
Find the snack supply canister. |
2022-09-10 22:10:34 | 10.2% | ||
|
Anti-Matter Over Mind
Kill a Controller without killing any of its mind-controlled Vortigaunt slaves. |
2022-09-10 22:05:09 | 26.5% | ||
|
Doctor’s Signature
Deliver the finishing blow to Gonarch with your Crowbar. |
2022-09-10 21:49:49 | 3.0% | ||
|
Unquestionably Ethical
Don't use the Cyanogen and let the Gonarch live. |
2022-09-10 21:45:12 | 2.1% | ||
|
The Plan
Use Cyanogen to kill Gonarch. |
2022-09-10 21:41:33 | 2.2% | ||
|
Gonad Glider
Get whacked into oblivion in the ledge fight. |
2022-09-10 20:47:40 | 5.6% | ||
|
Following the Rules
Use the welcome mat. |
2022-09-10 12:17:20 | 3.6% | ||
|
Orbital Trajectory
Skip the opening Xen island with a secret jump. |
2022-09-10 12:01:01 | 3.6% | ||
|
xen when
Wait too long to jump into the Lambda Teleporter. |
2022-09-10 09:15:39 | 3.9% | ||
|
Stealth Technology
Escape the Hangar in Surface Tension without alerting the Soldiers. |
2022-09-10 08:10:21 | 10.1% | ||
|
One Step Ahead
Kill 10 Enemies with Tripmines. |
2022-09-09 20:09:01 | 5.8% | ||
|
Our Brains And Your Brawn
Assemble all the possible Scientists and Guards at the end of Office Complex. |
2022-09-09 19:40:07 | 4.8% | ||
|
Well-Done
Cook a Grenade for too long. |
2022-09-09 18:39:35 | 17.7% | ||
|
Less Than Desirable Consequences
Die in the AMS Beam before starting the experiment. |
2022-09-09 18:03:29 | 14.1% | ||
|
Resonance Procrastinator
Refuse to insert the specimen into the Anti-Mass Spectrometer. |
2017-06-01 11:09:46 | 9.8% | ||
|
Rare Specimen
Send the Hidden Hat to Xen. |
2017-06-01 10:58:50 | 2.8% | ||
|
Hyper Saturation Conundrum
Drown in Lambda Core's coolant. |
2017-06-01 10:35:36 | 6.3% | ||
|
Premature Expulsion
Use an entire clip of Gluon ammo in one continuous shot. |
2017-06-01 10:22:17 | 26.4% | ||
|
Centripetal Attraction
Kill 20 Enemies with the Hivehand. |
2017-06-01 09:07:06 | 24.2% | ||
|
Universal Gravitation
Get killed by your own Snarks. |
2017-06-01 08:33:49 | 11.1% | ||
|
Nuclear Fishin'
Kill an Ichthyosaur with either the Tau or Gluon. |
2017-06-01 08:21:39 | 12.5% | ||
|
Futile Resistance
Kill 10 Enemies with Snarks. |
2017-06-01 08:10:37 | 7.2% | ||
|
Quantum Capacitance
Overcharge it anyway. |
2017-06-01 05:26:57 | 19.7% | ||
|
Ethically Questionable
Conduct all of the questionable research experiments. |
2017-06-01 05:16:20 | 5.6% | ||
|
Dead Reckoning
Kill an Assassin with the .357 Magnum. |
2017-05-31 18:05:08 | 23.4% | ||
|
Remote Detonation
Kill a Barnacle with a Satchel. |
2017-05-31 17:40:02 | 11.5% | ||
|
Calculated Trajectory
Kill 10 airborne Headcrabs using the Shotgun. |
2017-05-31 17:34:10 | 14.0% | ||
|
Kinetic Repulsion
Kill a Marine with their own Grenade. |
2017-05-31 16:57:24 | 6.0% | ||
|
Prophylactic Suggested
Get overtaken by a Headcrab's ample anterior. |
2017-05-31 16:52:16 | 34.4% | ||
|
Digital Wizardry
Kill 10 enemies with a reprogrammed Sentry. |
2017-05-31 16:37:45 | 9.3% | ||
|
Mega Hertz
Kill 5 Enemies with one Grenade. |
2017-05-31 16:00:45 | 19.0% | ||
|
Unified Coupling Theorum
Help the Barnacle and Headcrab find true love. |
2017-05-31 12:17:58 | 6.4% | ||
|
Inflammatory Actions
Kill a Headcrab using fire. |
2017-05-31 11:28:56 | 25.6% | ||
|
Proverbial Tinkerer
Interfere with the alarm and laptop in Anomalous Materials. |
2017-05-31 10:53:19 | 17.1% | ||
|
Gray Matter Propulsion
Headshot 20 Enemies with the .357 Magnum. |
2017-04-19 18:25:37 | 38.7% | ||
|
Caffeine Extraction
Perform surgical caffeine extraction from 20 vending machines. |
2017-04-19 18:01:41 | 22.9% | ||
|
Permeable Infrastructure
Use the alternate path in Office Complex. |
2017-04-19 17:53:45 | 24.1% | ||
|
Brownian Motion
Pass the toilet paper to the Scientist in need. |
2017-04-18 16:56:23 | 62.5% | ||
|
Convection Refinement
Ruin the microwave casserole. |
2017-04-18 16:53:44 | 51.2% | ||
|
Black Mesa Decathlon Winner
Escape the Gargantua’s Lair without taking any damage from Gargantuas. |
3.3% | |||
|
Laser Immunization
Complete Interloper without taking any laser damage. |
2.2% | |||
|
Post-Mortem Interval
Find each member of the missing research teams. |
1.8% |