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32 of 50 (64%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 6 Jan @ 1:17pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 12 Jan @ 12:38pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 12 Jan @ 1:50pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 17 Jan @ 12:23pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 6 Jan @ 1:04pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 16 Jan @ 1:18pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 12 Jan @ 1:26pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 17 Jan @ 10:24am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 17 Jan @ 11:23am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 13 Jan @ 12:11pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 17 Jan @ 2:00pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 6 Jan @ 1:53pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 12 Jan @ 1:35pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 12 Jan @ 1:59pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 17 Jan @ 11:13am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 12 Jan @ 12:48pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 17 Jan @ 1:57pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 6 Jan @ 1:48pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 6 Jan @ 12:57pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 17 Jan @ 10:27am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 18 Jan @ 3:28am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 13 Jan @ 11:29am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 6 Jan @ 1:40pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 13 Jan @ 11:43am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 17 Jan @ 10:15am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 13 Jan @ 12:13pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 17 Jan @ 1:33pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 18 Jan @ 3:20am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 12 Jan @ 1:15pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 6 Jan @ 1:35pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 18 Jan @ 3:59am

Well-Done

Cook a Grenade for too long.
Unlocked 12 Jan @ 1:15pm



Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

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.

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.​

Limitless Potential

Accept G-Man’s offer of employment.

Rather an Anticlimax

Decline G-Man’s offer of employment.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked