Black Mesa
NRW-Waffen Häuptling's Progress
Brownian Motion
Pass the toilet paper to the Scientist in need.
Unlocked 9 Feb 2024 at 2:38 PM
Caffeine Extraction
Perform surgical caffeine extraction from 20 vending machines.
Unlocked 9 Feb 2024 at 2:37 PM
Calculated Trajectory
Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 10 Feb 2024 at 6:25 PM
Centripetal Attraction
Kill 20 Enemies with the Hivehand.
Unlocked 12 Feb 2024 at 11:05 PM
Convection Refinement
Ruin the microwave casserole.
Unlocked 9 Feb 2024 at 2:36 PM
Dead Reckoning
Kill an Assassin with the .357 Magnum.
Unlocked 11 Feb 2024 at 5:16 PM
Digital Wizardry
Kill 10 enemies with a reprogrammed Sentry.
Unlocked 10 Feb 2024 at 6:08 PM
Ethically Questionable
Conduct all of the questionable research experiments.
Unlocked 11 Feb 2024 at 8:55 PM
Futile Resistance
Kill 10 Enemies with Snarks.
Unlocked 11 Feb 2024 at 9:15 PM
Gray Matter Propulsion
Headshot 20 Enemies with the .357 Magnum.
Unlocked 10 Feb 2024 at 7:39 PM
Hyper Saturation Conundrum
Drown in Lambda Core's coolant.
Unlocked 13 Feb 2024 at 1:12 AM
Inflammatory Actions
Kill a Headcrab using fire.
Unlocked 9 Feb 2024 at 3:10 PM
Kinetic Repulsion
Kill a Marine with their own Grenade.
Unlocked 10 Feb 2024 at 6:17 PM
Mega Hertz
Kill 5 Enemies with one Grenade.
Unlocked 9 Feb 2024 at 3:30 PM
Nuclear Fishin'
Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 13 Feb 2024 at 4:55 AM
Permeable Infrastructure
Use the alternate path in Office Complex.
Unlocked 9 Feb 2024 at 4:06 PM
Premature Expulsion
Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 13 Feb 2024 at 1:08 AM
Prophylactic Suggested
Get overtaken by a Headcrab's ample anterior.
Unlocked 9 Feb 2024 at 3:06 PM
Proverbial Tinkerer
Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 9 Feb 2024 at 2:33 PM
Quantum Capacitance
Overcharge it anyway.
Unlocked 11 Feb 2024 at 8:56 PM
Rare Specimen
Send the Hidden Hat to Xen.
Unlocked 13 Feb 2024 at 2:57 AM
Remote Detonation
Kill a Barnacle with a Satchel.
Unlocked 10 Feb 2024 at 7:04 PM
Resonance Procrastinator
Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 9 Feb 2024 at 2:50 PM
Unified Coupling Theorum
Help the Barnacle and Headcrab find true love.
Unlocked 10 Feb 2024 at 6:28 PM
Universal Gravitation
Get killed by your own Snarks.
Unlocked 11 Feb 2024 at 8:49 PM
Prolific Popper
Kill all Protozoans in the Borderworld.
Unlocked 11 Jun 2025 at 7:17 PM
PhD in Pacifism
Don't kill any Vortigaunts in the Borderworld.
Unlocked 11 Jun 2025 at 7:17 PM
The Rarest Specimen
Unlocked 11 Jun 2025 at 1:01 PM
One Step Ahead
Kill 10 Enemies with Tripmines.
Unlocked 10 Feb 2024 at 7:32 PM
Stealth Technology
Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 13 Feb 2024 at 12:07 AM
xen when
Unlocked 13 Feb 2024 at 2:57 AM
Our Brains And Your Brawn
Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 9 Feb 2024 at 4:28 PM
Less Than Desirable Consequences
Die in the AMS Beam before starting the experiment.
Unlocked 9 Feb 2024 at 2:46 PM
Orbital Trajectory
Skip the opening Xen island with a secret jump.
Unlocked 13 Feb 2024 at 4:39 AM
Following the Rules
Unlocked 13 Feb 2024 at 4:59 AM
Doctor’s Signature
Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 22 Feb 2024 at 7:02 PM
Gonad Glider
Get whacked into oblivion in the ledge fight.
Unlocked 20 Feb 2024 at 4:38 PM
Post-Mortem Interval
Find each member of the missing research teams.
Unlocked 22 Feb 2024 at 5:49 PM
The Plan
Unlocked 22 Feb 2024 at 5:52 PM
Unquestionably Ethical
Unlocked 22 Feb 2024 at 5:53 PM
Contest Propellant
Unlocked 24 Feb 2024 at 4:05 AM
Laser Immunization
Complete Interloper without taking any laser damage.
Unlocked 10 Jun 2025 at 9:49 PM
Black Mesa Decathlon Winner
Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 24 Feb 2024 at 4:25 AM
Anti-Matter Over Mind
Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 23 Feb 2024 at 10:35 PM
Specimen GG
Take out all three Healing Crystals in Nihilanth’s Chamber at the same time.
Unlocked 10 Jun 2025 at 10:31 PM
Late for Work
Defeat Nihilanth in under 4 minutes.
Unlocked 10 Jun 2025 at 10:33 PM
Limitless Potential
Accept G-Man’s offer of employment.
Unlocked 10 Jun 2025 at 10:36 PM
Rather an Anticlimax
Decline G-Man’s offer of employment.
Unlocked 11 Jun 2025 at 1:04 PM
Pepperoni Precipitation
Unlocked 10 Jun 2025 at 10:34 PM
Well-Done
Cook a Grenade for too long.
Unlocked 9 Feb 2024 at 3:30 PM