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50 of 50 (100%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 6 Aug @ 6:36am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 6 Aug @ 9:37am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 6 Aug @ 10:36am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 8 Aug @ 5:24am

Convection Refinement

Ruin the microwave casserole.
Unlocked 6 Aug @ 6:35am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 7 Aug @ 6:56am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 6 Aug @ 12:37pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 8 Aug @ 2:51am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 8 Aug @ 5:35am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 7 Aug @ 3:38am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 8 Aug @ 7:20am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 6 Aug @ 8:42am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 6 Aug @ 10:26am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 6 Aug @ 11:57am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 8 Aug @ 3:19am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 6 Aug @ 9:34am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 8 Aug @ 7:16am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 6 Aug @ 8:22am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 6 Aug @ 6:28am

Quantum Capacitance

Overcharge it anyway.
Unlocked 8 Aug @ 2:51am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 21 Sep @ 1:57pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 7 Aug @ 1:43am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 6 Aug @ 6:51am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 6 Aug @ 1:07pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 8 Aug @ 2:18am

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked 10 Aug @ 5:19am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 9 Aug @ 1:39pm

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 23 Sep @ 9:55am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 7 Aug @ 3:42am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 8 Aug @ 5:53am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 8 Aug @ 8:20am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 10 Aug @ 6:51am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 6 Aug @ 6:48am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 8 Aug @ 8:25am

Following the Rules

Use the welcome mat.
Unlocked 8 Aug @ 8:54am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 9 Aug @ 4:56am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 8 Aug @ 1:00pm

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked 9 Aug @ 4:46am

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 9 Aug @ 4:46am

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 9 Aug @ 4:49am

Contest Propellant

Find the snack supply canister.
Unlocked 9 Aug @ 5:18am

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 12 Aug @ 10:50am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 9 Aug @ 10:50am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 9 Aug @ 5:12am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 10 Aug @ 8:18am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 10 Aug @ 8:19am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 9 Aug @ 2:07pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 9 Aug @ 2:03pm

Pepperoni Precipitation

View the *other* secret ending.
Unlocked 26 Sep @ 9:27am

Well-Done

Cook a Grenade for too long.
Unlocked 6 Aug @ 9:49am