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Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 1 Mar, 2017 @ 9:54am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 2 Mar, 2017 @ 11:06am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 5 Feb, 2019 @ 6:50pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 16 Feb, 2019 @ 9:47pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 1 Mar, 2017 @ 9:53am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 14 Jul, 2019 @ 4:52pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 14 Jul, 2019 @ 5:04pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 7 Feb, 2019 @ 1:42pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 20 Jul, 2019 @ 6:35pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 5 Feb, 2019 @ 7:01pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 14 Jul, 2019 @ 5:06pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 13 Jul, 2019 @ 4:54pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 13 Jul, 2019 @ 5:04pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 20 Jul, 2019 @ 6:45pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 13 Jul, 2019 @ 5:05pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 13 Jul, 2019 @ 4:45pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 29 Jun, 2019 @ 9:07pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 7 Feb, 2019 @ 8:35pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 12 Jul, 2019 @ 8:13pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 24 Feb, 2019 @ 7:35pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 25 Jul, 2019 @ 12:56pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 16 Feb, 2019 @ 9:48pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 12 Jul, 2019 @ 7:48pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 20 Jul, 2019 @ 4:39pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 20 Jul, 2019 @ 4:49pm

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked 23 Apr, 2021 @ 6:56pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 23 Apr, 2021 @ 6:42pm

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 8 May, 2021 @ 9:33pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 1 Apr, 2021 @ 11:45pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 1 Apr, 2021 @ 11:51pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 2 Apr, 2021 @ 5:22pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 30 Mar, 2021 @ 2:12pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 29 Mar, 2021 @ 12:19am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 2 Apr, 2021 @ 5:37pm

Following the Rules

Use the welcome mat.
Unlocked 2 Apr, 2021 @ 5:53pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 12 Apr, 2021 @ 10:53pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 3 Apr, 2021 @ 12:13am

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked 12 Apr, 2021 @ 10:30pm

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 12 Apr, 2021 @ 10:29pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 12 Apr, 2021 @ 10:33pm

Contest Propellant

Find the snack supply canister.
Unlocked 12 Apr, 2021 @ 11:08pm

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 24 Apr, 2021 @ 4:05pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 13 Apr, 2021 @ 6:59pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 12 Apr, 2021 @ 11:05pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 24 Apr, 2021 @ 4:20pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 24 Apr, 2021 @ 4:37pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 24 Apr, 2021 @ 4:45pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 24 Apr, 2021 @ 4:44pm

Pepperoni Precipitation

View the *other* secret ending.
Unlocked 27 Apr, 2021 @ 4:41pm

Well-Done

Cook a Grenade for too long.
Unlocked 29 Mar, 2021 @ 12:37am