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Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Sep 5, 2020 @ 9:50am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Sep 5, 2020 @ 11:24am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Mar 21, 2021 @ 1:10pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Sep 6, 2020 @ 9:24pm

Convection Refinement

Ruin the microwave casserole.
Unlocked Sep 5, 2020 @ 9:46am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Mar 21, 2021 @ 1:25pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked Mar 22, 2021 @ 2:08pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Mar 22, 2021 @ 2:42pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked Mar 22, 2021 @ 1:57pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Sep 5, 2020 @ 1:33pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Mar 22, 2021 @ 12:10pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Sep 6, 2020 @ 11:12am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked Sep 5, 2020 @ 2:49pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Mar 21, 2021 @ 12:46pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Mar 22, 2021 @ 12:40pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Mar 22, 2021 @ 2:49pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Sep 7, 2020 @ 10:23am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Sep 5, 2020 @ 1:36pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Mar 19, 2021 @ 6:42am

Quantum Capacitance

Overcharge it anyway.
Unlocked Mar 22, 2021 @ 11:55am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked Mar 24, 2021 @ 7:00pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Sep 6, 2020 @ 10:49am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked Mar 19, 2021 @ 6:59am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Mar 22, 2021 @ 2:59pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked Mar 21, 2021 @ 12:18pm

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked Mar 23, 2021 @ 12:26pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Sep 7, 2020 @ 10:20am

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked Mar 25, 2021 @ 9:15am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked Mar 22, 2021 @ 12:46pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked Mar 22, 2021 @ 2:05pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked Mar 23, 2021 @ 9:45am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked Sep 5, 2020 @ 11:17am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked Mar 19, 2021 @ 7:01am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked Mar 21, 2021 @ 1:02pm

Following the Rules

Use the welcome mat.
Unlocked Mar 23, 2021 @ 9:01am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked Sep 6, 2020 @ 9:34pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked Mar 22, 2021 @ 5:35pm

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked Mar 23, 2021 @ 8:55am

The Plan

Use Cyanogen to kill Gonarch.
Unlocked Mar 23, 2021 @ 8:54am

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked Mar 23, 2021 @ 8:55am

Contest Propellant

Find the snack supply canister.
Unlocked Sep 7, 2020 @ 9:06am

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked Mar 22, 2021 @ 5:26pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked Mar 22, 2021 @ 3:13pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Sep 7, 2020 @ 9:04am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked Mar 21, 2021 @ 1:35pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked Mar 21, 2021 @ 1:37pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Sep 7, 2020 @ 10:45am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Sep 7, 2020 @ 10:49am

Pepperoni Precipitation

View the *other* secret ending.
Unlocked Mar 24, 2021 @ 2:15pm

Well-Done

Cook a Grenade for too long.
Unlocked Mar 21, 2021 @ 12:40pm