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30 of 50 (60%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 22 May, 2015 @ 4:44pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 22 May, 2015 @ 5:01pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 24 May, 2015 @ 10:42am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 23 May, 2015 @ 1:39pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 22 May, 2015 @ 4:42pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 23 May, 2015 @ 9:42am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 24 May, 2015 @ 12:05pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 24 May, 2015 @ 10:59am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 24 May, 2015 @ 3:56pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 23 May, 2015 @ 1:51pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 24 May, 2015 @ 11:10am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 24 May, 2015 @ 9:29am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 24 May, 2015 @ 12:18pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 24 May, 2015 @ 11:17am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 24 May, 2015 @ 11:28am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 24 May, 2015 @ 10:33am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 23 May, 2015 @ 5:54pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 24 May, 2015 @ 10:28am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 24 May, 2015 @ 12:03pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 24 May, 2015 @ 9:48am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 3 Jun, 2015 @ 5:51pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 24 May, 2015 @ 11:16am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 24 May, 2015 @ 10:12am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 24 May, 2015 @ 12:23pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 23 May, 2015 @ 5:51pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 18 Oct, 2021 @ 5:45pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 15 Apr, 2020 @ 3:09pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 13 Apr, 2020 @ 9:12pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 13 Apr, 2020 @ 9:16pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 13 Apr, 2020 @ 9:17pm



Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts 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.

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.

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.

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked