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Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 12 May, 2015 @ 2:42pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 13 May, 2015 @ 11:21pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 31 Jul, 2016 @ 7:55am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 31 Jul, 2016 @ 9:38am

Convection Refinement

Ruin the microwave casserole.
Unlocked 12 May, 2015 @ 2:41pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 13 May, 2015 @ 11:25pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 31 Jul, 2016 @ 1:16pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 13 May, 2015 @ 2:46pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 31 Jul, 2016 @ 10:09am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 13 May, 2015 @ 11:11am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 13 May, 2015 @ 11:45pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 31 Jul, 2016 @ 9:29pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 31 Jul, 2016 @ 8:23am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 20 Jan, 2016 @ 8:07pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 31 Jul, 2016 @ 8:43am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 12 May, 2015 @ 3:23pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 13 May, 2015 @ 11:33pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 13 May, 2015 @ 3:28pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 29 Jul, 2016 @ 11:49pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 31 Jul, 2016 @ 8:27am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 2 Aug, 2016 @ 7:24pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 30 Jul, 2016 @ 9:32am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 29 Jul, 2016 @ 11:45pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 31 Jul, 2016 @ 9:34pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 31 Jul, 2016 @ 8:49am

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked 8 May, 2020 @ 4:18am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 22 Apr, 2020 @ 10:47am

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 24 Apr, 2020 @ 4:20am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 22 Feb, 2020 @ 10:33am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 23 Apr, 2020 @ 8:00pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 23 Apr, 2020 @ 9:00pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 22 Feb, 2020 @ 9:56am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 22 Feb, 2020 @ 9:23am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 18 Apr, 2020 @ 8:47pm

Following the Rules

Use the welcome mat.
Unlocked 18 Apr, 2020 @ 8:58pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 20 Apr, 2020 @ 10:48pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 20 Apr, 2020 @ 9:40pm

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked 8 May, 2020 @ 3:00am

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 23 Apr, 2020 @ 11:25pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 23 Apr, 2020 @ 11:26pm

Contest Propellant

Find the snack supply canister.
Unlocked 20 Apr, 2020 @ 10:57pm

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 2 Jul, 2020 @ 6:05pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 20 Apr, 2020 @ 11:12pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 20 Apr, 2020 @ 10:55pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 22 Apr, 2020 @ 11:19am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 24 Apr, 2020 @ 4:19am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 22 Apr, 2020 @ 11:28am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 22 Apr, 2020 @ 11:27am

Pepperoni Precipitation

View the *other* secret ending.
Unlocked 8 May, 2020 @ 1:44am

Well-Done

Cook a Grenade for too long.
Unlocked 22 Feb, 2020 @ 9:57am