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44 of 50 (88%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Jun 17, 2015 @ 12:17pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Jun 18, 2015 @ 9:56am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Jan 11 @ 7:58am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Jan 13 @ 6:09am

Convection Refinement

Ruin the microwave casserole.
Unlocked Jun 17, 2015 @ 12:16pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Jan 11 @ 3:25pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked Jan 13 @ 7:19am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Jan 12 @ 9:24am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked Jan 12 @ 9:15am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Jun 18, 2015 @ 12:37pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Jan 13 @ 7:56am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Jan 11 @ 2:30am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked Jan 11 @ 8:28am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Jan 11 @ 7:52am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Jan 12 @ 11:26am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Jan 11 @ 7:46am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Jan 13 @ 7:54am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Jan 11 @ 2:24am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Jun 17, 2015 @ 12:11pm

Quantum Capacitance

Overcharge it anyway.
Unlocked Jun 20, 2015 @ 12:44am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Jan 11 @ 9:06am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked Jan 11 @ 2:17am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Jan 11 @ 9:31am

Universal Gravitation

Get killed by your own Snarks.
Unlocked Jan 12 @ 9:10am

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked Jan 14 @ 2:19am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Jan 14 @ 9:32am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked Jan 12 @ 8:00am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked Jan 13 @ 7:03am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked Jan 13 @ 8:55am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked Jan 11 @ 8:08am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked Jan 11 @ 2:18am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked Jan 13 @ 1:17pm

Following the Rules

Use the welcome mat.
Unlocked Jan 13 @ 1:29pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked Jan 13 @ 3:31pm

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked Jan 14 @ 1:59am

The Plan

Use Cyanogen to kill Gonarch.
Unlocked Jan 13 @ 4:19pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked Jan 13 @ 4:28pm

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked Jan 14 @ 9:32am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked Jan 14 @ 8:33am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Jan 14 @ 2:10am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked Jan 14 @ 11:12am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Jan 14 @ 11:21am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Jan 14 @ 11:20am

Well-Done

Cook a Grenade for too long.
Unlocked Jan 11 @ 7:23am



Rare Specimen

Send the Hidden Hat to Xen.

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.

Late for Work

Defeat Nihilanth in under 4 minutes.​
+3

3 hidden achievements remaining

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