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Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Apr 22, 2019 @ 4:10pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Dec 10, 2019 @ 9:09pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Dec 13, 2019 @ 9:07pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Dec 15, 2019 @ 6:57pm

Convection Refinement

Ruin the microwave casserole.
Unlocked Apr 22, 2019 @ 4:09pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Dec 16, 2019 @ 1:48pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked Mar 9, 2020 @ 4:24pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Dec 15, 2019 @ 4:32pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked Dec 16, 2019 @ 1:15pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Sep 8, 2017 @ 9:59pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Dec 16, 2019 @ 1:59pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Dec 10, 2019 @ 8:54pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked Dec 15, 2019 @ 2:00pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Sep 24, 2017 @ 5:43pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Dec 15, 2019 @ 5:09pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Dec 10, 2019 @ 9:03pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Dec 16, 2019 @ 1:56pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Dec 10, 2019 @ 8:28pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Dec 10, 2019 @ 7:56pm

Quantum Capacitance

Overcharge it anyway.
Unlocked Dec 15, 2019 @ 4:29pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked Jan 21, 2021 @ 6:01pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Dec 13, 2019 @ 9:14pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked Dec 10, 2019 @ 8:08pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Dec 15, 2019 @ 1:39pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked Dec 15, 2019 @ 4:27pm

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked Jan 24, 2021 @ 10:12pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Jan 24, 2021 @ 12:06am

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked Jan 24, 2021 @ 12:38am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked Mar 9, 2020 @ 7:44pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked Mar 11, 2020 @ 9:09pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked Jan 21, 2021 @ 6:01pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked Mar 7, 2020 @ 5:55pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked Mar 7, 2020 @ 4:46pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked Mar 11, 2020 @ 11:07pm

Following the Rules

Use the welcome mat.
Unlocked Mar 12, 2020 @ 5:31pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked Jan 23, 2021 @ 4:53pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked Jan 23, 2021 @ 3:59pm

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked Jan 24, 2021 @ 10:34pm

The Plan

Use Cyanogen to kill Gonarch.
Unlocked Jan 24, 2021 @ 10:13pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked Jan 24, 2021 @ 10:14pm

Contest Propellant

Find the snack supply canister.
Unlocked Jan 24, 2021 @ 10:27pm

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked Apr 15, 2021 @ 5:28pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked Jan 24, 2021 @ 10:31pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Jan 24, 2021 @ 10:26pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked Jan 24, 2021 @ 12:35am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked Jan 24, 2021 @ 11:43pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Jan 24, 2021 @ 12:40am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Jan 24, 2021 @ 12:41am

Pepperoni Precipitation

View the *other* secret ending.
Unlocked Apr 15, 2021 @ 5:54pm

Well-Done

Cook a Grenade for too long.
Unlocked Mar 7, 2020 @ 5:10pm