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Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Oct 31, 2019 @ 2:47am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Nov 1, 2019 @ 7:31pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Nov 4, 2019 @ 2:50am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Nov 8, 2019 @ 2:03am

Convection Refinement

Ruin the microwave casserole.
Unlocked Oct 31, 2019 @ 2:46am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Nov 5, 2019 @ 3:51am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked Nov 4, 2019 @ 3:53am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Nov 6, 2019 @ 12:38am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked Nov 6, 2019 @ 12:27am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Nov 4, 2019 @ 2:43am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Nov 9, 2019 @ 9:57pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Nov 6, 2019 @ 12:29am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked Nov 4, 2019 @ 2:34am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Nov 4, 2019 @ 1:44am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Nov 7, 2019 @ 10:16pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Nov 3, 2019 @ 2:22am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Nov 9, 2019 @ 9:54pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Nov 1, 2019 @ 7:34pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Oct 31, 2019 @ 2:43am

Quantum Capacitance

Overcharge it anyway.
Unlocked Nov 6, 2019 @ 12:35am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked Nov 10, 2019 @ 12:23am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Nov 4, 2019 @ 3:15am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked Oct 31, 2019 @ 2:58am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Nov 2, 2019 @ 4:18pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked Nov 6, 2019 @ 12:27am

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked Nov 24, 2021 @ 7:29pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Nov 19, 2021 @ 2:31am

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked Nov 19, 2021 @ 3:13am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked Feb 24, 2020 @ 1:59am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked Feb 27, 2020 @ 2:25am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked Feb 27, 2020 @ 3:43am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked Mar 6, 2020 @ 2:49am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked Feb 15, 2020 @ 2:53am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked Mar 3, 2020 @ 2:53am

Following the Rules

Use the welcome mat.
Unlocked Feb 28, 2020 @ 3:40am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked Nov 14, 2021 @ 9:27am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked Feb 27, 2021 @ 4:23pm

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked Nov 21, 2021 @ 5:44pm

The Plan

Use Cyanogen to kill Gonarch.
Unlocked Nov 21, 2021 @ 5:42pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked Nov 21, 2021 @ 5:44pm

Contest Propellant

Find the snack supply canister.
Unlocked Nov 21, 2021 @ 3:20am

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked Dec 2, 2021 @ 3:46pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked Nov 21, 2021 @ 8:37pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Nov 14, 2021 @ 9:49am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked Nov 19, 2021 @ 3:09am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked Nov 21, 2021 @ 1:41pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Mar 3, 2020 @ 2:57am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Mar 3, 2020 @ 2:57am

Pepperoni Precipitation

View the *other* secret ending.
Unlocked Nov 21, 2021 @ 1:42pm

Well-Done

Cook a Grenade for too long.
Unlocked Feb 15, 2020 @ 3:10am