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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 17 Jun, 2016 @ 9:35pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 19 Jun, 2016 @ 3:58pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 4 Jan, 2021 @ 8:05pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 6 Apr, 2019 @ 2:50pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 17 Jun, 2016 @ 9:32pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 7 Jan, 2021 @ 9:41am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 12 Jan, 2021 @ 11:38am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 12 Jan, 2021 @ 1:53pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 9 Jan, 2021 @ 9:16am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 14 Mar, 2020 @ 8:05pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 9 Jan, 2021 @ 1:38pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 30 Dec, 2019 @ 6:49pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 12 Jan, 2021 @ 12:52pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 12 Jan, 2021 @ 11:02am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 10 Jan, 2021 @ 10:03am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 18 Jun, 2016 @ 4:40pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 9 Jan, 2021 @ 10:39am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 14 Mar, 2020 @ 8:35pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 17 Jun, 2016 @ 9:23pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 15 Mar, 2020 @ 12:27am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 10 Jan, 2021 @ 9:45am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 31 Dec, 2019 @ 3:34pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 12 Jan, 2021 @ 10:44am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 10 Jan, 2021 @ 10:36am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 9 Jan, 2021 @ 9:09am

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked 13 Jan, 2021 @ 2:17pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 11 Jan, 2021 @ 10:22pm

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 11 Jan, 2021 @ 10:59pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 12 Jan, 2021 @ 3:06pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 9 Jan, 2021 @ 9:20am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 12 Jan, 2021 @ 5:29pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 12 Jan, 2021 @ 11:32am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 17 Dec, 2020 @ 8:10pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 10 Jan, 2021 @ 9:58am

Following the Rules

Use the welcome mat.
Unlocked 12 Jan, 2021 @ 5:46pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 12 Jan, 2021 @ 8:03pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 12 Jan, 2021 @ 7:23pm

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked 13 Jan, 2021 @ 2:19pm

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 13 Jan, 2021 @ 2:19pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 13 Jan, 2021 @ 2:20pm

Contest Propellant

Find the snack supply canister.
Unlocked 12 Jan, 2021 @ 8:19pm

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 13 Jan, 2021 @ 6:53pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 12 Jan, 2021 @ 8:23pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 11 Jan, 2021 @ 8:38pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 12 Jan, 2021 @ 9:46pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 12 Jan, 2021 @ 9:48pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 11 Jan, 2021 @ 11:02pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 11 Jan, 2021 @ 11:01pm

Pepperoni Precipitation

View the *other* secret ending.
Unlocked 12 Jan, 2021 @ 9:49pm

Well-Done

Cook a Grenade for too long.
Unlocked 11 Jan, 2021 @ 8:47pm