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Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 28 Jun, 2018 @ 7:36pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 9 Jul, 2019 @ 4:14pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 27 Jul, 2019 @ 10:00pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 13 Jul, 2019 @ 11:35pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 28 Jun, 2018 @ 7:36pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 9 Jul, 2019 @ 3:20pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 15 Jul, 2018 @ 10:11pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 9 Jul, 2019 @ 5:54pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 27 Jul, 2019 @ 9:55pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 9 Jul, 2019 @ 12:30am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 22 Jul, 2019 @ 10:53pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 28 Jun, 2018 @ 7:53pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 27 Jul, 2019 @ 11:28pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 15 Aug, 2019 @ 1:03am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 27 Jul, 2019 @ 11:33pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 4 Aug, 2019 @ 4:31pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 22 Jul, 2019 @ 11:37pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 27 Jul, 2019 @ 9:58pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 27 Jul, 2019 @ 10:09pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 13 Jul, 2019 @ 11:06pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 2 Sep, 2019 @ 6:54pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 15 Aug, 2019 @ 12:36am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 27 Jul, 2019 @ 10:22pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 15 Aug, 2019 @ 12:50am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 22 Jul, 2019 @ 10:22pm

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked 19 May, 2021 @ 12:11am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 18 May, 2021 @ 11:59pm

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 19 May, 2021 @ 12:28am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 16 May, 2021 @ 7:37pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 16 May, 2021 @ 8:44pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 16 May, 2021 @ 8:56pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 16 May, 2021 @ 7:25pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 16 May, 2021 @ 6:43pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 16 May, 2021 @ 9:04pm

Following the Rules

Use the welcome mat.
Unlocked 16 May, 2021 @ 9:15pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 19 May, 2021 @ 1:28am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 18 May, 2021 @ 12:15am

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked 19 May, 2021 @ 1:26am

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 18 May, 2021 @ 12:47am

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 18 May, 2021 @ 12:48am

Contest Propellant

Find the snack supply canister.
Unlocked 18 May, 2021 @ 12:58am

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 19 May, 2021 @ 11:39pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 18 May, 2021 @ 1:09am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 18 May, 2021 @ 12:57am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 19 May, 2021 @ 12:26am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 19 May, 2021 @ 12:26am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 24 May, 2020 @ 2:57pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 24 May, 2020 @ 2:56pm

Pepperoni Precipitation

View the *other* secret ending.
Unlocked 19 May, 2021 @ 12:34am

Well-Done

Cook a Grenade for too long.
Unlocked 16 May, 2021 @ 6:57pm