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50 of 50 (100%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 12 Feb @ 3:36am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 12 Feb @ 4:00am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 12 Feb @ 7:44am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 16 Feb @ 4:12am

Convection Refinement

Ruin the microwave casserole.
Unlocked 12 Feb @ 3:33am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 13 Feb @ 8:20am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 12 Feb @ 7:02am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 15 Feb @ 3:26am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 16 Feb @ 3:09am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 12 Feb @ 9:26am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 16 Feb @ 5:51am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 12 Feb @ 4:10am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 12 Feb @ 7:21am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 13 Feb @ 7:40am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 15 Feb @ 3:55am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 12 Feb @ 6:31am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 16 Feb @ 5:51am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 12 Feb @ 4:18am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 12 Feb @ 3:29am

Quantum Capacitance

Overcharge it anyway.
Unlocked 15 Feb @ 3:26am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 16 Feb @ 8:09am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 12 Feb @ 8:14am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 12 Feb @ 3:48am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 12 Feb @ 10:32am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 15 Feb @ 3:15am

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked 17 Feb @ 8:04am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 17 Feb @ 7:51am

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 17 Feb @ 8:28am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 12 Feb @ 9:33am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 16 Feb @ 4:47am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 16 Feb @ 8:09am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 12 Feb @ 6:41am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 12 Feb @ 3:46am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 16 Feb @ 8:30am

Following the Rules

Use the welcome mat.
Unlocked 16 Feb @ 8:53am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 17 Feb @ 2:16am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 16 Feb @ 11:19pm

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked 17 Feb @ 1:50am

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 17 Feb @ 1:50am

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 17 Feb @ 1:53am

Contest Propellant

Find the snack supply canister.
Unlocked 17 Feb @ 2:55am

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 18 Feb @ 1:27am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 17 Feb @ 9:40am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 17 Feb @ 2:53am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 17 Feb @ 8:20am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 17 Feb @ 8:25am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 17 Feb @ 8:31am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 17 Feb @ 8:30am

Pepperoni Precipitation

View the *other* secret ending.
Unlocked 17 Feb @ 9:09am

Well-Done

Cook a Grenade for too long.
Unlocked 12 Feb @ 4:45am