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17 of 50 (34%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Apr 25 @ 2:00am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked May 1 @ 12:13pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked May 2 @ 9:26am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Apr 28 @ 11:22am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked May 1 @ 11:42am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked May 2 @ 9:49am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked May 2 @ 11:29am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked May 2 @ 9:50am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked May 2 @ 11:31am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked May 4 @ 9:25am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked May 2 @ 10:28am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked Apr 26 @ 5:11am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked May 3 @ 12:36pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked May 3 @ 12:45pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked May 4 @ 9:58am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked May 4 @ 10:04am

Well-Done

Cook a Grenade for too long.
Unlocked May 2 @ 2:36am



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Convection Refinement

Ruin the microwave casserole.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Inflammatory Actions

Kill a Headcrab using fire.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

Permeable Infrastructure

Use the alternate path in Office Complex.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

Quantum Capacitance

Overcharge it anyway.

Rare Specimen

Send the Hidden Hat to Xen.

Remote Detonation

Kill a Barnacle with a Satchel.

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Universal Gravitation

Get killed by your own Snarks.

Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

Gonad Glider

Get whacked into oblivion in the ledge fight.

Post-Mortem Interval

Find each member of the missing research teams.

Laser Immunization

Complete Interloper without taking any laser damage.

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.

Late for Work

Defeat Nihilanth in under 4 minutes.​
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked