Black Mesa
Cooler's Progress
Brownian Motion
Pass the toilet paper to the Scientist in need.
Unlocked 21 Feb 2021 at 8:48 PM
Caffeine Extraction
Perform surgical caffeine extraction from 20 vending machines.
Calculated Trajectory
Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 24 Aug 2021 at 3:53 PM
Centripetal Attraction
Kill 20 Enemies with the Hivehand.
Unlocked 24 Aug 2021 at 4:30 PM
Convection Refinement
Ruin the microwave casserole.
Unlocked 21 Feb 2021 at 8:47 PM
Dead Reckoning
Kill an Assassin with the .357 Magnum.
Unlocked 24 Aug 2021 at 6:01 PM
Digital Wizardry
Kill 10 enemies with a reprogrammed Sentry.
Ethically Questionable
Conduct all of the questionable research experiments.
Futile Resistance
Kill 10 Enemies with Snarks.
Unlocked 24 Aug 2021 at 5:46 PM
Gray Matter Propulsion
Headshot 20 Enemies with the .357 Magnum.
Unlocked 24 Aug 2021 at 2:56 PM
Hyper Saturation Conundrum
Drown in Lambda Core's coolant.
Unlocked 24 Aug 2021 at 6:33 PM
Inflammatory Actions
Kill a Headcrab using fire.
Kinetic Repulsion
Kill a Marine with their own Grenade.
Unlocked 24 Aug 2021 at 3:28 PM
Mega Hertz
Kill 5 Enemies with one Grenade.
Unlocked 24 Aug 2021 at 4:32 PM
Nuclear Fishin'
Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 25 Aug 2021 at 4:25 PM
Permeable Infrastructure
Use the alternate path in Office Complex.
Premature Expulsion
Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 24 Aug 2021 at 6:25 PM
Prophylactic Suggested
Get overtaken by a Headcrab's ample anterior.
Unlocked 24 Aug 2021 at 6:39 PM
Proverbial Tinkerer
Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 21 Feb 2021 at 8:41 PM
Quantum Capacitance
Overcharge it anyway.
Unlocked 24 Aug 2021 at 3:03 PM
Rare Specimen
Send the Hidden Hat to Xen.
Remote Detonation
Kill a Barnacle with a Satchel.
Unlocked 24 Aug 2021 at 5:36 PM
Resonance Procrastinator
Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 21 Feb 2021 at 8:59 PM
Unified Coupling Theorum
Help the Barnacle and Headcrab find true love.
Universal Gravitation
Get killed by your own Snarks.
Unlocked 24 Aug 2021 at 5:40 PM
Prolific Popper
Kill all Protozoans in the Borderworld.
PhD in Pacifism
Don't kill any Vortigaunts in the Borderworld.
Unlocked 26 Aug 2021 at 3:59 PM
The Rarest Specimen
One Step Ahead
Kill 10 Enemies with Tripmines.
Stealth Technology
Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 24 Aug 2021 at 4:51 PM
xen when
Unlocked 25 Aug 2021 at 3:59 PM
Our Brains And Your Brawn
Assemble all the possible Scientists and Guards at the end of Office Complex.
Less Than Desirable Consequences
Die in the AMS Beam before starting the experiment.
Orbital Trajectory
Skip the opening Xen island with a secret jump.
Unlocked 25 Aug 2021 at 4:05 PM
Following the Rules
Unlocked 26 Aug 2021 at 9:50 AM
Doctor’s Signature
Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 26 Aug 2021 at 12:54 PM
Gonad Glider
Get whacked into oblivion in the ledge fight.
Unlocked 26 Aug 2021 at 11:38 AM
Post-Mortem Interval
Find each member of the missing research teams.
The Plan
Unquestionably Ethical
Contest Propellant
Unlocked 26 Aug 2021 at 1:21 PM
Laser Immunization
Complete Interloper without taking any laser damage.
Unlocked 26 Aug 2021 at 3:59 PM
Black Mesa Decathlon Winner
Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Anti-Matter Over Mind
Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 26 Aug 2021 at 1:15 PM
Specimen GG
Take out all three Healing Crystals in Nihilanth’s Chamber at the same time.
Unlocked 26 Aug 2021 at 4:16 PM
Late for Work
Defeat Nihilanth in under 4 minutes.
Unlocked 26 Aug 2021 at 4:17 PM
Limitless Potential
Accept G-Man’s offer of employment.
Unlocked 26 Aug 2021 at 4:21 PM
Rather an Anticlimax
Decline G-Man’s offer of employment.
Unlocked 26 Aug 2021 at 4:23 PM
Pepperoni Precipitation
Well-Done
Cook a Grenade for too long.
Unlocked 27 Mar 2021 at 2:59 PM