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25 of 25 (100%) achievements earned:

Personal Achievements
 
Unlocked Jul 25, 2015 @ 6:56am

Brownian Motion

Pass the toilet paper to the scientist in need.
Unlocked May 15, 2017 @ 11:13pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 machines.
Unlocked May 15, 2017 @ 11:13pm

Calculated Trajectory

Kill 10 Airborne Headcrabs using the Shotgun.
Unlocked May 15, 2017 @ 11:13pm

Centripetal Attraction

Kill 20 enemies with the Hivehand.
Unlocked Jul 25, 2015 @ 6:55am

Convection Refinement

Ruin the microwave casserole.
Unlocked Jul 26, 2015 @ 11:39am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked May 15, 2017 @ 11:13pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked May 15, 2017 @ 11:13pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked May 15, 2017 @ 11:13pm

Futile Resistance

Kill 10 enemies with Snarks.
Unlocked Jul 25, 2015 @ 8:42am

Gray Matter Propulsion

Headshot 20 enemies with the .357 magnum.
Unlocked May 15, 2017 @ 11:13pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked May 15, 2017 @ 11:13pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked May 15, 2017 @ 11:13pm

Kinetic Repulsion

Kill a Marine with their own grenade.
Unlocked May 15, 2017 @ 11:13pm

Mega Hertz

Kill 5 enemies with one grenade.
Unlocked May 15, 2017 @ 11:13pm

Nuclear Fishin'

Kill an Icthyosaur with either the Tau or Gluon.
Unlocked May 15, 2017 @ 11:13pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked May 15, 2017 @ 11:13pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Jul 24, 2015 @ 2:19pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Jul 25, 2015 @ 6:55am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked May 15, 2017 @ 11:13pm

Quantum Capacitance

Overcharge it anyway.
Unlocked May 15, 2017 @ 11:13pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked May 15, 2017 @ 11:13pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked May 15, 2017 @ 11:13pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked May 15, 2017 @ 11:13pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked May 15, 2017 @ 11:13pm

Universal Gravitation

Get killed by your own Snarks.