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Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 31 Jan, 2020 @ 5:51am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 31 Jan, 2020 @ 5:58am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 6 Jan, 2020 @ 1:44pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 2 Feb, 2020 @ 8:50am

Convection Refinement

Ruin the microwave casserole.
Unlocked 2 Jan, 2020 @ 8:38am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 12 Jan, 2020 @ 10:53am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 20 Jan, 2020 @ 1:29pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 12 Jan, 2020 @ 12:11pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 22 Jan, 2020 @ 8:22am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 3 Jan, 2020 @ 4:28am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 22 Jan, 2020 @ 7:20am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 2 Jan, 2020 @ 9:08am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 6 Jan, 2020 @ 1:58pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 2 Feb, 2020 @ 9:22am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 24 Jan, 2020 @ 2:31am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 2 Feb, 2020 @ 8:33am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 28 Jan, 2020 @ 10:41am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 12 Jan, 2020 @ 11:50am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 31 Jan, 2020 @ 5:59am

Quantum Capacitance

Overcharge it anyway.
Unlocked 31 Jan, 2020 @ 6:04am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 14 Apr @ 10:50am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 20 Jan, 2020 @ 1:15pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 31 Jan, 2020 @ 6:15am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 22 Jan, 2020 @ 7:48am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 12 Jan, 2020 @ 11:49am

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked 20 Apr @ 12:29pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 17 Apr @ 2:44pm

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 17 Apr @ 2:15pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 8 Apr @ 12:42pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 8 Apr @ 1:08pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 15 Apr @ 9:24am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 20 Apr @ 10:53am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 17 Apr @ 3:07pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 15 Apr @ 9:30am

Following the Rules

Use the welcome mat.
Unlocked 18 Apr @ 6:13am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 16 Apr @ 12:03pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 18 Apr @ 12:09am

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked 18 Apr @ 5:18am

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 18 Apr @ 4:34am

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 18 Apr @ 4:35am

Contest Propellant

Find the snack supply canister.
Unlocked 18 Apr @ 6:07am

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 17 Apr @ 1:42pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 17 Apr @ 2:58pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 16 Apr @ 12:10pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 18 Apr @ 5:59am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 18 Apr @ 5:53am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 25 Mar, 2020 @ 8:29am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 25 Mar, 2020 @ 8:28am

Pepperoni Precipitation

View the *other* secret ending.
Unlocked 23 Apr @ 12:25pm

Well-Done

Cook a Grenade for too long.
Unlocked 15 Mar @ 9:45am