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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 5 Jan, 2022 @ 6:03am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 7 Jan, 2022 @ 9:15am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 5 Jan, 2022 @ 9:07am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 7 Jan, 2022 @ 7:45am

Convection Refinement

Ruin the microwave casserole.
Unlocked 5 Jan, 2022 @ 6:01am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 8 Jan, 2022 @ 6:27am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 7 Jan, 2022 @ 9:03am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 10 Jan, 2022 @ 6:38am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 7 Jan, 2022 @ 7:40am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 5 Jan, 2022 @ 10:14am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 9 Jan, 2022 @ 9:59am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 8 Jan, 2022 @ 4:47am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 5 Jan, 2022 @ 10:08am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 9 Jan, 2022 @ 7:17am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 8 Jan, 2022 @ 3:39am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 9 Jan, 2022 @ 7:31am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 9 Jan, 2022 @ 7:55am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 5 Jan, 2022 @ 9:06am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 9 Jan, 2022 @ 5:49am

Quantum Capacitance

Overcharge it anyway.
Unlocked 10 Jan, 2022 @ 6:03am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 10 Jan, 2022 @ 3:07am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 5 Jan, 2022 @ 9:27am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 9 Jan, 2022 @ 5:55am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 9 Jan, 2022 @ 7:46am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 6 Jan, 2022 @ 2:31pm

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked 10 Jan, 2022 @ 12:21am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 9 Jan, 2022 @ 5:25am

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 10 Jan, 2022 @ 6:03am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 6 Jan, 2022 @ 2:10am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 7 Jan, 2022 @ 8:46am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 9 Jan, 2022 @ 9:59am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 9 Jan, 2022 @ 7:43am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 9 Jan, 2022 @ 5:56am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 9 Jan, 2022 @ 10:04am

Following the Rules

Use the welcome mat.
Unlocked 8 Jan, 2022 @ 1:57am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 8 Jan, 2022 @ 5:20am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 8 Jan, 2022 @ 4:45am

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked 9 Jan, 2022 @ 2:05pm

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 10 Jan, 2022 @ 1:02am

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 10 Jan, 2022 @ 1:06am

Contest Propellant

Find the snack supply canister.
Unlocked 9 Jan, 2022 @ 4:20am

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 10 Jan, 2022 @ 5:33am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 10 Jan, 2022 @ 5:45am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 9 Jan, 2022 @ 4:20am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 10 Jan, 2022 @ 9:41am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 9 Jan, 2022 @ 5:41am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 9 Jan, 2022 @ 5:46am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 9 Jan, 2022 @ 5:46am

Pepperoni Precipitation

View the *other* secret ending.
Unlocked 11 Jan, 2022 @ 12:21am

Well-Done

Cook a Grenade for too long.
Unlocked 5 Jan, 2022 @ 9:18am