| Achievement | Unlocked | Visibility | Global Unlocks | |
|---|---|---|---|---|
|
Prolific Popper
Kill all Protozoans in the Borderworld. |
2022-07-31 19:20:48 | 1.7% | ||
|
Post-Mortem Interval
Find each member of the missing research teams. |
2022-07-31 18:37:59 | 1.8% | ||
|
Unquestionably Ethical
Don't use the Cyanogen and let the Gonarch live. |
2021-02-09 23:35:54 | 2.1% | ||
|
The Plan
Use Cyanogen to kill Gonarch. |
2021-02-09 23:35:08 | 2.2% | ||
|
Limitless Potential
Accept G-Man’s offer of employment. |
2020-09-19 20:46:53 | 23.8% | ||
|
Rather an Anticlimax
Decline G-Man’s offer of employment. |
2020-09-19 20:45:38 | 15.6% | ||
|
PhD in Pacifism
Don't kill any Vortigaunts in the Borderworld. |
2020-09-19 20:16:18 | 11.2% | ||
|
Black Mesa Decathlon Winner
Escape the Gargantua’s Lair without taking any damage from Gargantuas. |
2020-05-31 20:49:02 | 3.3% | ||
|
Anti-Matter Over Mind
Kill a Controller without killing any of its mind-controlled Vortigaunt slaves. |
2020-05-31 20:44:18 | 26.6% | ||
|
Doctor’s Signature
Deliver the finishing blow to Gonarch with your Crowbar. |
2020-05-31 20:36:42 | 3.0% | ||
|
Gonad Glider
Get whacked into oblivion in the ledge fight. |
2020-05-31 20:24:09 | 5.6% | ||
|
Orbital Trajectory
Skip the opening Xen island with a secret jump. |
2020-05-31 20:05:46 | 3.6% | ||
|
Our Brains And Your Brawn
Assemble all the possible Scientists and Guards at the end of Office Complex. |
2020-05-31 20:02:48 | 4.8% | ||
|
One Step Ahead
Kill 10 Enemies with Tripmines. |
2020-05-31 19:41:07 | 5.8% | ||
|
Less Than Desirable Consequences
Die in the AMS Beam before starting the experiment. |
2020-05-31 19:33:32 | 14.2% | ||
|
Well-Done
Cook a Grenade for too long. |
2020-05-30 03:32:12 | 17.7% | ||
|
Stealth Technology
Escape the Hangar in Surface Tension without alerting the Soldiers. |
2020-05-30 03:06:55 | 10.2% | ||
|
Kinetic Repulsion
Kill a Marine with their own Grenade. |
2018-03-04 19:52:06 | 6.0% | ||
|
Digital Wizardry
Kill 10 enemies with a reprogrammed Sentry. |
2018-03-04 19:50:36 | 9.3% | ||
|
Inflammatory Actions
Kill a Headcrab using fire. |
2018-03-04 19:48:13 | 25.6% | ||
|
Unified Coupling Theorum
Help the Barnacle and Headcrab find true love. |
2018-03-04 19:45:25 | 6.4% | ||
|
Prophylactic Suggested
Get overtaken by a Headcrab's ample anterior. |
2018-03-04 19:44:07 | 34.5% | ||
|
Nuclear Fishin'
Kill an Ichthyosaur with either the Tau or Gluon. |
2018-03-04 19:34:12 | 12.5% | ||
|
Ethically Questionable
Conduct all of the questionable research experiments. |
2018-03-04 19:31:00 | 5.6% | ||
|
Universal Gravitation
Get killed by your own Snarks. |
2018-03-04 19:27:42 | 11.1% | ||
|
Premature Expulsion
Use an entire clip of Gluon ammo in one continuous shot. |
2018-03-04 19:17:29 | 26.4% | ||
|
Rare Specimen
Send the Hidden Hat to Xen. |
2018-03-04 19:15:02 | 2.8% | ||
|
Hyper Saturation Conundrum
Drown in Lambda Core's coolant. |
2018-03-04 18:50:24 | 6.3% | ||
|
Proverbial Tinkerer
Interfere with the alarm and laptop in Anomalous Materials. |
2018-03-04 18:46:22 | 17.1% | ||
|
Remote Detonation
Kill a Barnacle with a Satchel. |
2018-03-04 18:44:00 | 11.5% | ||
|
Quantum Capacitance
Overcharge it anyway. |
2018-03-04 18:32:35 | 19.7% | ||
|
Resonance Procrastinator
Refuse to insert the specimen into the Anti-Mass Spectrometer. |
2018-03-04 18:30:59 | 9.8% | ||
|
Futile Resistance
Kill 10 Enemies with Snarks. |
2018-03-02 20:51:43 | 7.2% | ||
|
Centripetal Attraction
Kill 20 Enemies with the Hivehand. |
2018-02-24 21:30:56 | 24.2% | ||
|
Dead Reckoning
Kill an Assassin with the .357 Magnum. |
2018-02-09 18:15:58 | 23.4% | ||
|
Caffeine Extraction
Perform surgical caffeine extraction from 20 vending machines. |
2018-02-05 01:14:44 | 22.9% | ||
|
Mega Hertz
Kill 5 Enemies with one Grenade. |
2018-01-30 23:56:28 | 19.0% | ||
|
Calculated Trajectory
Kill 10 airborne Headcrabs using the Shotgun. |
2018-01-30 23:55:09 | 14.0% | ||
|
Gray Matter Propulsion
Headshot 20 Enemies with the .357 Magnum. |
2018-01-30 23:35:52 | 38.7% | ||
|
Permeable Infrastructure
Use the alternate path in Office Complex. |
2018-01-06 15:15:31 | 24.1% | ||
|
Brownian Motion
Pass the toilet paper to the Scientist in need. |
2018-01-06 14:29:19 | 62.5% | ||
|
Convection Refinement
Ruin the microwave casserole. |
2018-01-06 14:28:40 | 51.2% | ||
|
xen when
Wait too long to jump into the Lambda Teleporter. |
3.9% | |||
|
Late for Work
Defeat Nihilanth in under 4 minutes. |
2.9% | |||
|
Pepperoni Precipitation
View the *other* secret ending. |
1.7% | |||
|
Laser Immunization
Complete Interloper without taking any laser damage. |
2.2% | |||
|
Following the Rules
Use the welcome mat. |
3.6% | |||
|
The Rarest Specimen
Carry the Hidden Hat to Endgame. |
1.8% | |||
|
Contest Propellant
Find the snack supply canister. |
10.2% | |||
|
Specimen GG
Take out all three Healing Crystals in Nihilanth’s Chamber at the same time. |
2.9% |