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20 of 50 (40%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 23 Jan @ 8:21am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 23 Jan @ 8:49am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 23 Jan @ 2:19pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 23 Jan @ 8:18am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 23 Jan @ 2:54pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 7 Feb @ 7:31pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 23 Jan @ 1:59pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 23 Jan @ 9:48am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 23 Jan @ 12:22pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 10 Apr @ 8:17am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 23 Jan @ 9:48am

Quantum Capacitance

Overcharge it anyway.
Unlocked 23 Jan @ 3:49pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 7 Feb @ 7:31pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 10 Apr @ 10:21am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 23 Jan @ 8:36am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 7 Feb @ 8:16pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 7 Feb @ 8:18pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 10 Apr @ 10:51am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 10 Apr @ 10:50am

Well-Done

Cook a Grenade for too long.
Unlocked 27 Jan @ 10:45am



Centripetal Attraction

Kill 20 Enemies with the Hivehand.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Permeable Infrastructure

Use the alternate path in Office Complex.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

Rare Specimen

Send the Hidden Hat to Xen.

Remote Detonation

Kill a Barnacle with a Satchel.

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

Gonad Glider

Get whacked into oblivion in the ledge fight.

Post-Mortem Interval

Find each member of the missing research teams.

Laser Immunization

Complete Interloper without taking any laser damage.

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.

Late for Work

Defeat Nihilanth in under 4 minutes.​
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked