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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 22 May, 2015 @ 11:27am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 17 Jan, 2021 @ 3:43pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 27 Dec, 2019 @ 3:49pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 28 May, 2015 @ 3:36pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 22 May, 2015 @ 11:26am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 27 Dec, 2019 @ 4:42pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 24 Nov, 2023 @ 5:31pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 24 Nov, 2023 @ 6:53pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 27 Dec, 2019 @ 12:47pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 23 May, 2015 @ 7:27pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 24 Nov, 2023 @ 6:01pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 23 Nov, 2023 @ 12:13am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 24 Nov, 2023 @ 5:34pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 22 Nov, 2023 @ 11:44pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 24 Nov, 2023 @ 5:05pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 23 May, 2015 @ 6:47pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 28 Dec, 2019 @ 8:27pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 23 May, 2015 @ 9:17pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 7 Nov, 2018 @ 5:12pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 23 Nov, 2023 @ 6:22pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 4 Dec, 2023 @ 4:23pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 19 Jan, 2021 @ 2:00pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 24 Nov, 2023 @ 5:50pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 24 Nov, 2023 @ 4:58pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 24 Nov, 2023 @ 5:25pm

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked 4 Dec, 2023 @ 5:43pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 5 Dec, 2023 @ 5:44pm

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 5 Dec, 2023 @ 6:09pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 24 Nov, 2023 @ 5:37pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 22 Nov, 2023 @ 6:27pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 4 Dec, 2023 @ 4:23pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 4 Dec, 2023 @ 9:18am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 24 Nov, 2023 @ 4:33pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 4 Dec, 2023 @ 2:26am

Following the Rules

Use the welcome mat.
Unlocked 4 Dec, 2023 @ 2:34am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 4 Dec, 2023 @ 2:22am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 24 Nov, 2023 @ 7:00pm

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked 6 Dec, 2023 @ 7:21am

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 23 Nov, 2023 @ 12:55am

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 4 Dec, 2023 @ 2:16am

Contest Propellant

Find the snack supply canister.
Unlocked 23 Nov, 2023 @ 5:03pm

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 6 Dec, 2023 @ 8:28am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 5 Dec, 2023 @ 4:08pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 23 Nov, 2023 @ 5:01pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 4 Dec, 2023 @ 2:37am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 4 Dec, 2023 @ 2:39am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 24 Nov, 2023 @ 4:18pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 23 Nov, 2023 @ 8:01pm

Pepperoni Precipitation

View the *other* secret ending.
Unlocked 6 Dec, 2023 @ 12:55pm

Well-Done

Cook a Grenade for too long.
Unlocked 21 Nov, 2023 @ 7:38pm