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Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Oct 29, 2016 @ 11:35am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Oct 29, 2016 @ 11:57pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Oct 30, 2016 @ 10:56am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Oct 30, 2016 @ 5:31pm

Convection Refinement

Ruin the microwave casserole.
Unlocked Oct 29, 2016 @ 11:34am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Oct 30, 2016 @ 10:06pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked Mar 7, 2020 @ 9:49am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Oct 30, 2016 @ 3:25pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked Oct 30, 2016 @ 10:07pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Oct 30, 2016 @ 12:20am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Oct 30, 2016 @ 10:07pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Oct 30, 2016 @ 10:07pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked Sep 23, 2018 @ 4:35pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Dec 12, 2019 @ 3:16pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Oct 30, 2016 @ 2:02pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Oct 29, 2016 @ 11:33pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Oct 30, 2016 @ 10:07pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Oct 30, 2016 @ 10:07pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Oct 30, 2016 @ 3:25pm

Quantum Capacitance

Overcharge it anyway.
Unlocked Oct 30, 2016 @ 1:56pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked Oct 30, 2016 @ 10:07pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Oct 30, 2016 @ 4:23pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked Oct 30, 2016 @ 10:07pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Oct 30, 2016 @ 10:07pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked Oct 30, 2016 @ 10:07pm

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked Apr 12, 2020 @ 5:11pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Mar 9, 2020 @ 11:56am

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked May 8, 2020 @ 11:26am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked Mar 6, 2020 @ 6:13pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked Mar 7, 2020 @ 9:41am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked May 6, 2020 @ 12:06pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked Mar 6, 2020 @ 4:18pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked Mar 6, 2020 @ 3:28pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked Mar 7, 2020 @ 10:38am

Following the Rules

Use the welcome mat.
Unlocked Mar 8, 2020 @ 11:21am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked Apr 9, 2020 @ 10:57am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked Apr 4, 2020 @ 9:55am

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked Apr 12, 2020 @ 5:11pm

The Plan

Use Cyanogen to kill Gonarch.
Unlocked Apr 12, 2020 @ 5:11pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked Apr 18, 2020 @ 7:28pm

Contest Propellant

Find the snack supply canister.
Unlocked Feb 22, 2020 @ 10:09pm

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked Feb 23, 2020 @ 7:26pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked Mar 9, 2020 @ 11:38am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Apr 30, 2020 @ 1:14pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked Feb 23, 2020 @ 7:42pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked Mar 9, 2020 @ 12:30pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Feb 23, 2020 @ 7:47pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Mar 12, 2020 @ 5:15pm

Pepperoni Precipitation

View the *other* secret ending.
Unlocked Apr 24, 2020 @ 6:43pm

Well-Done

Cook a Grenade for too long.
Unlocked Apr 8, 2020 @ 9:18am