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Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Jul 3, 2018 @ 6:46pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Jul 3, 2018 @ 7:39pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Jul 5, 2018 @ 7:31pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Jul 6, 2018 @ 7:31pm

Convection Refinement

Ruin the microwave casserole.
Unlocked Jul 3, 2018 @ 6:44pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Jul 5, 2018 @ 11:45pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked Jul 10, 2018 @ 1:48pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Jul 6, 2018 @ 5:34pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked Jul 6, 2018 @ 5:26pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Jul 5, 2018 @ 7:58pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Jul 10, 2018 @ 2:40pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Jul 10, 2018 @ 4:01pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked Jul 6, 2018 @ 6:00pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Jul 6, 2018 @ 8:20pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Jul 6, 2018 @ 8:24pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Jul 10, 2018 @ 3:54pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Jul 10, 2018 @ 2:31pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Jul 3, 2018 @ 7:54pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Jul 10, 2018 @ 3:43pm

Quantum Capacitance

Overcharge it anyway.
Unlocked Jul 10, 2018 @ 3:33pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked Jul 12, 2018 @ 2:41am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Jul 10, 2018 @ 1:49pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked Jul 5, 2018 @ 10:02pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Jul 10, 2018 @ 2:47pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked Jul 6, 2018 @ 5:23pm

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked Jun 24, 2023 @ 7:09pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Jun 22, 2023 @ 12:34pm

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked Jun 22, 2023 @ 1:08pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked Jun 22, 2023 @ 1:26pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked Jun 22, 2023 @ 3:01pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked Jun 24, 2023 @ 3:13pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked Jun 22, 2023 @ 5:00pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked Jun 22, 2023 @ 1:39pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked Jun 22, 2023 @ 1:31pm

Following the Rules

Use the welcome mat.
Unlocked Jun 22, 2023 @ 5:08pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked Jun 24, 2023 @ 2:55pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked Jun 21, 2023 @ 10:46pm

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked Jun 24, 2023 @ 2:49pm

The Plan

Use Cyanogen to kill Gonarch.
Unlocked Jun 24, 2023 @ 2:48pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked Jun 24, 2023 @ 2:49pm

Contest Propellant

Find the snack supply canister.
Unlocked Jun 22, 2023 @ 1:48pm

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked Jun 22, 2023 @ 12:34pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked Jun 22, 2023 @ 2:02pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Jun 21, 2023 @ 11:41pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked Jun 22, 2023 @ 1:05pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked Jun 22, 2023 @ 1:07pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Jun 22, 2023 @ 1:10pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Jun 22, 2023 @ 1:10pm

Pepperoni Precipitation

View the *other* secret ending.
Unlocked Jun 25, 2023 @ 10:00pm

Well-Done

Cook a Grenade for too long.
Unlocked Jun 22, 2023 @ 12:44am