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Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 30 Oct, 2019 @ 6:00pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 19 Oct, 2019 @ 7:31pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 19 Dec, 2020 @ 8:07pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 22 Oct, 2019 @ 12:01pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 19 Oct, 2019 @ 4:58pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 19 Feb, 2020 @ 1:43pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 29 Jul, 2020 @ 9:57pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 21 Oct, 2019 @ 6:18pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 27 Feb, 2020 @ 2:47pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 19 Oct, 2019 @ 9:02pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 27 Aug, 2020 @ 11:11am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 30 Oct, 2019 @ 6:16pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 16 Dec, 2020 @ 1:45pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 24 Oct, 2019 @ 8:51pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 12 Mar, 2020 @ 1:34pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 28 Jul, 2020 @ 11:24am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 17 Dec, 2019 @ 8:28am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 21 Oct, 2019 @ 9:28am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 28 Jul, 2020 @ 10:36am

Quantum Capacitance

Overcharge it anyway.
Unlocked 24 Jan, 2020 @ 12:36pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 12 Dec, 2022 @ 2:41pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 29 Jul, 2020 @ 1:31pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 28 Jul, 2020 @ 10:57am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 30 Oct, 2019 @ 6:27pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 5 Aug, 2020 @ 10:52am

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked 4 Dec, 2022 @ 2:18pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 10 Aug, 2021 @ 3:32pm

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 16 Dec, 2022 @ 9:46am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 15 Mar, 2020 @ 9:49pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 16 Mar, 2020 @ 5:21pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 12 Dec, 2022 @ 2:37pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 14 Dec, 2020 @ 1:50pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 6 Dec, 2022 @ 6:56pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 28 Aug, 2020 @ 6:09pm

Following the Rules

Use the welcome mat.
Unlocked 5 Dec, 2022 @ 8:23am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 5 Dec, 2022 @ 8:13am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 3 Dec, 2022 @ 4:34pm

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked 5 Dec, 2022 @ 7:50am

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 4 Dec, 2022 @ 2:19pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 4 Dec, 2022 @ 2:40pm

Contest Propellant

Find the snack supply canister.
Unlocked 5 Dec, 2022 @ 8:43am

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 16 Dec, 2022 @ 9:01am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 9 Aug, 2021 @ 2:47pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 10 Feb, 2020 @ 6:55pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 10 Aug, 2021 @ 3:59pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 5 Dec, 2022 @ 12:37pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 10 Aug, 2021 @ 4:23pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 10 Aug, 2021 @ 4:18pm

Pepperoni Precipitation

View the *other* secret ending.
Unlocked 28 Dec, 2022 @ 6:50pm

Well-Done

Cook a Grenade for too long.
Unlocked 5 Oct, 2021 @ 1:42pm