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Digital Wizardry
8.8%Kill 10 enemies with a reprogrammed Sentry.
Unlocked
Brownian Motion
61.0%Pass the toilet paper to the Scientist in need.
Unlocked
Convection Refinement
50.2%Ruin the microwave casserole.
Unlocked
Anti-Matter Over Mind
27.6%Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Black Mesa Decathlon Winner
3.6%Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Caffeine Extraction
21.0%Perform surgical caffeine extraction from 20 vending machines.
Calculated Trajectory
13.4%Kill 10 airborne Headcrabs using the Shotgun.
Centripetal Attraction
22.7%Kill 20 Enemies with the Hivehand.
Hidden Achievement
10.7%Keep playing to discover this achievement
Dead Reckoning
23.0%Kill an Assassin with the .357 Magnum.
Doctor’s Signature
3.3%Deliver the finishing blow to Gonarch with your Crowbar.
Ethically Questionable
5.3%Conduct all of the questionable research experiments.
Hidden Achievement
3.9%Keep playing to discover this achievement
Futile Resistance
7.0%Kill 10 Enemies with Snarks.
Gonad Glider
5.9%Get whacked into oblivion in the ledge fight.
Gray Matter Propulsion
36.6%Headshot 20 Enemies with the .357 Magnum.
Hyper Saturation Conundrum
5.9%Drown in Lambda Core's coolant.
Inflammatory Actions
25.6%Kill a Headcrab using fire.
Kinetic Repulsion
6.0%Kill a Marine with their own Grenade.
Laser Immunization
2.5%Complete Interloper without taking any laser damage.
