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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 18 Feb @ 1:12am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 18 Feb @ 3:08am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 22 Sep @ 7:41pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 9 Sep @ 12:35am

Convection Refinement

Ruin the microwave casserole.
Unlocked 18 Feb @ 1:06am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 8 Sep @ 8:42pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 22 Sep @ 8:18pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 29 Sep @ 10:45pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 22 Sep @ 11:50pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 8 Sep @ 9:43pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 22 Sep @ 10:49pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 22 Sep @ 9:40pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 29 Sep @ 10:08pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 22 Sep @ 9:23pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 22 Sep @ 9:59pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 22 Sep @ 11:32pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 18 Sep @ 1:38am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 15 Sep @ 10:34pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 22 Sep @ 9:44pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 22 Sep @ 9:57pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 26 Nov @ 6:41am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 22 Sep @ 7:37pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 22 Sep @ 9:05pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 22 Sep @ 9:25pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 22 Sep @ 11:37pm

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked 29 Nov @ 12:44am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 18 Sep @ 1:28am

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 27 Nov @ 12:20am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 29 Sep @ 10:28pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 29 Sep @ 9:41pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 22 Sep @ 11:12pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 28 Nov @ 2:00am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 22 Sep @ 9:01pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 22 Sep @ 11:20pm

Following the Rules

Use the welcome mat.
Unlocked 29 Sep @ 11:40pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 29 Sep @ 11:27pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 29 Sep @ 10:51pm

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked 27 Nov @ 11:14pm

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 20 Oct @ 10:03pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 20 Oct @ 10:13pm

Contest Propellant

Find the snack supply canister.
Unlocked 29 Sep @ 7:47pm

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 20 Oct @ 11:50pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 21 Oct @ 12:38am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 16 Sep @ 12:57am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 21 Oct @ 12:07am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 21 Oct @ 12:20am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 18 Sep @ 2:06am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 18 Sep @ 2:05am

Pepperoni Precipitation

View the *other* secret ending.
Unlocked 27 Nov @ 7:21am

Well-Done

Cook a Grenade for too long.
Unlocked 22 Sep @ 7:22pm