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Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Sep 22, 2022 @ 12:36pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Sep 24, 2022 @ 7:46am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Oct 28, 2023 @ 5:58am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Oct 19, 2022 @ 11:41am

Convection Refinement

Ruin the microwave casserole.
Unlocked Sep 22, 2022 @ 12:34pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Sep 27, 2022 @ 4:19am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked Sep 10, 2023 @ 10:26am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Nov 20, 2023 @ 11:32am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked Nov 20, 2023 @ 11:34am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Sep 26, 2022 @ 10:37am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Sep 16, 2023 @ 1:56am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Oct 20, 2022 @ 8:42am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked Oct 30, 2023 @ 10:56am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Sep 27, 2022 @ 4:16am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Nov 22, 2023 @ 4:31am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Oct 28, 2023 @ 5:57am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Oct 21, 2022 @ 11:15am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Oct 28, 2023 @ 5:20am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Oct 27, 2023 @ 1:09pm

Quantum Capacitance

Overcharge it anyway.
Unlocked Sep 18, 2023 @ 11:55am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked Nov 25, 2023 @ 5:50am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Nov 20, 2023 @ 9:38am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked Oct 28, 2023 @ 5:00am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Sep 22, 2023 @ 12:49pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked Nov 20, 2023 @ 11:31am

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked Nov 25, 2023 @ 10:51am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Sep 23, 2023 @ 11:25am

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked Nov 26, 2023 @ 7:44am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked Nov 20, 2023 @ 9:51am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked Nov 25, 2023 @ 2:49am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked Sep 19, 2023 @ 8:24am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked Oct 30, 2023 @ 10:41am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked Sep 9, 2023 @ 4:25am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked Sep 19, 2023 @ 8:33am

Following the Rules

Use the welcome mat.
Unlocked Sep 22, 2023 @ 1:42am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked Nov 25, 2023 @ 9:53am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked Nov 25, 2023 @ 8:59am

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked Nov 25, 2023 @ 10:53am

The Plan

Use Cyanogen to kill Gonarch.
Unlocked Nov 25, 2023 @ 10:52am

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked Nov 25, 2023 @ 10:52am

Contest Propellant

Find the snack supply canister.
Unlocked Nov 26, 2023 @ 4:55am

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked Nov 26, 2023 @ 7:13am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked Sep 23, 2023 @ 9:27am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Oct 21, 2022 @ 8:29am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked Sep 23, 2023 @ 11:47am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked Nov 26, 2023 @ 7:42am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Oct 21, 2022 @ 11:40am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Oct 21, 2022 @ 11:45am

Pepperoni Precipitation

View the *other* secret ending.
Unlocked Sep 23, 2023 @ 11:50am

Well-Done

Cook a Grenade for too long.
Unlocked Sep 10, 2023 @ 10:25am