| Achievement | Unlocked | Visibility | Global Unlocks | |
|---|---|---|---|---|
|
Post-Mortem Interval
Find each member of the missing research teams. |
2021-01-11 02:03:12 | 1.8% | ||
|
The Plan
Use Cyanogen to kill Gonarch. |
2021-01-11 02:00:58 | 2.2% | ||
|
Unquestionably Ethical
Don't use the Cyanogen and let the Gonarch live. |
2021-01-11 01:56:20 | 2.1% | ||
|
Prolific Popper
Kill all Protozoans in the Borderworld. |
2021-01-11 01:12:41 | 1.7% | ||
|
Black Mesa Decathlon Winner
Escape the Gargantua’s Lair without taking any damage from Gargantuas. |
2021-01-10 22:36:28 | 3.3% | ||
|
Rather an Anticlimax
Decline G-Man’s offer of employment. |
2021-01-10 21:37:38 | 15.6% | ||
|
Pepperoni Precipitation
View the *other* secret ending. |
2021-01-10 21:33:06 | 1.7% | ||
|
Limitless Potential
Accept G-Man’s offer of employment. |
2021-01-09 09:47:42 | 23.8% | ||
|
The Rarest Specimen
Carry the Hidden Hat to Endgame. |
2021-01-09 09:43:16 | 1.8% | ||
|
Late for Work
Defeat Nihilanth in under 4 minutes. |
2021-01-09 09:41:14 | 2.9% | ||
|
Specimen GG
Take out all three Healing Crystals in Nihilanth’s Chamber at the same time. |
2021-01-09 09:36:56 | 2.9% | ||
|
Laser Immunization
Complete Interloper without taking any laser damage. |
2021-01-09 07:02:35 | 2.2% | ||
|
PhD in Pacifism
Don't kill any Vortigaunts in the Borderworld. |
2021-01-09 07:02:35 | 11.2% | ||
|
Contest Propellant
Find the snack supply canister. |
2021-01-09 05:12:35 | 10.2% | ||
|
Anti-Matter Over Mind
Kill a Controller without killing any of its mind-controlled Vortigaunt slaves. |
2021-01-09 05:08:29 | 26.6% | ||
|
Doctor’s Signature
Deliver the finishing blow to Gonarch with your Crowbar. |
2021-01-09 05:08:29 | 3.0% | ||
|
Gonad Glider
Get whacked into oblivion in the ledge fight. |
2021-01-09 03:05:59 | 5.6% | ||
|
Following the Rules
Use the welcome mat. |
2021-01-08 09:28:50 | 3.6% | ||
|
xen when
Wait too long to jump into the Lambda Teleporter. |
2021-01-08 08:40:01 | 3.9% | ||
|
Orbital Trajectory
Skip the opening Xen island with a secret jump. |
2021-01-08 08:36:59 | 3.6% | ||
|
Rare Specimen
Send the Hidden Hat to Xen. |
2021-01-08 08:31:00 | 2.8% | ||
|
Hyper Saturation Conundrum
Drown in Lambda Core's coolant. |
2021-01-08 07:04:32 | 6.3% | ||
|
Premature Expulsion
Use an entire clip of Gluon ammo in one continuous shot. |
2021-01-08 07:00:50 | 26.4% | ||
|
Nuclear Fishin'
Kill an Ichthyosaur with either the Tau or Gluon. |
2021-01-08 06:48:34 | 12.5% | ||
|
Stealth Technology
Escape the Hangar in Surface Tension without alerting the Soldiers. |
2021-01-08 06:38:40 | 10.2% | ||
|
Centripetal Attraction
Kill 20 Enemies with the Hivehand. |
2021-01-08 06:16:46 | 24.2% | ||
|
Ethically Questionable
Conduct all of the questionable research experiments. |
2021-01-07 11:27:14 | 5.6% | ||
|
Quantum Capacitance
Overcharge it anyway. |
2021-01-07 11:25:55 | 19.7% | ||
|
Futile Resistance
Kill 10 Enemies with Snarks. |
2021-01-07 11:19:36 | 7.2% | ||
|
Universal Gravitation
Get killed by your own Snarks. |
2021-01-07 11:18:44 | 11.1% | ||
|
Dead Reckoning
Kill an Assassin with the .357 Magnum. |
2021-01-07 10:35:50 | 23.4% | ||
|
Gray Matter Propulsion
Headshot 20 Enemies with the .357 Magnum. |
2021-01-07 09:11:12 | 38.7% | ||
|
One Step Ahead
Kill 10 Enemies with Tripmines. |
2021-01-07 08:56:12 | 5.8% | ||
|
Remote Detonation
Kill a Barnacle with a Satchel. |
2021-01-06 07:13:40 | 11.5% | ||
|
Kinetic Repulsion
Kill a Marine with their own Grenade. |
2021-01-06 06:53:31 | 6.0% | ||
|
Digital Wizardry
Kill 10 enemies with a reprogrammed Sentry. |
2021-01-06 06:42:54 | 9.3% | ||
|
Our Brains And Your Brawn
Assemble all the possible Scientists and Guards at the end of Office Complex. |
2021-01-05 13:07:51 | 4.8% | ||
|
Inflammatory Actions
Kill a Headcrab using fire. |
2021-01-05 12:39:53 | 25.6% | ||
|
Unified Coupling Theorum
Help the Barnacle and Headcrab find true love. |
2021-01-05 12:32:17 | 6.4% | ||
|
Mega Hertz
Kill 5 Enemies with one Grenade. |
2021-01-05 12:24:43 | 19.0% | ||
|
Calculated Trajectory
Kill 10 airborne Headcrabs using the Shotgun. |
2021-01-05 12:19:29 | 14.0% | ||
|
Permeable Infrastructure
Use the alternate path in Office Complex. |
2021-01-05 12:16:11 | 24.1% | ||
|
Well-Done
Cook a Grenade for too long. |
2021-01-05 11:39:02 | 17.7% | ||
|
Prophylactic Suggested
Get overtaken by a Headcrab's ample anterior. |
2021-01-05 09:57:57 | 34.5% | ||
|
Resonance Procrastinator
Refuse to insert the specimen into the Anti-Mass Spectrometer. |
2021-01-05 09:51:58 | 9.8% | ||
|
Less Than Desirable Consequences
Die in the AMS Beam before starting the experiment. |
2021-01-05 09:49:33 | 14.2% | ||
|
Proverbial Tinkerer
Interfere with the alarm and laptop in Anomalous Materials. |
2021-01-05 09:40:26 | 17.1% | ||
|
Caffeine Extraction
Perform surgical caffeine extraction from 20 vending machines. |
2021-01-05 09:39:45 | 22.9% | ||
|
Brownian Motion
Pass the toilet paper to the Scientist in need. |
2021-01-05 09:35:48 | 62.5% | ||
|
Convection Refinement
Ruin the microwave casserole. |
2021-01-05 09:33:46 | 51.2% |