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33 of 50 (66%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 27 Apr @ 5:47am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 28 Apr @ 1:51pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 27 Apr @ 1:36am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 1 May @ 6:28am

Convection Refinement

Ruin the microwave casserole.
Unlocked 27 Apr @ 5:46am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 30 Apr @ 3:01am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 30 Apr @ 1:28am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 30 Apr @ 3:55am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 1 May @ 5:29am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 27 Apr @ 1:35am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 1 May @ 7:53am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 28 Apr @ 7:27am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 29 Apr @ 1:05am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 29 Apr @ 11:34pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 1 May @ 5:09am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 28 Apr @ 10:23am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 1 May @ 7:53am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 27 Apr @ 4:07am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 27 Apr @ 5:37am

Quantum Capacitance

Overcharge it anyway.
Unlocked 30 Apr @ 3:49am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 28 Apr @ 2:45pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 29 Apr @ 1:18am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 28 Apr @ 2:09pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 30 Apr @ 3:56am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 29 Apr @ 11:45pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 1 May @ 6:57am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 1 May @ 8:56am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 28 Apr @ 10:36am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 28 Apr @ 6:26am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 1 May @ 9:00am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 26 May @ 7:31am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 26 May @ 7:31am

Well-Done

Cook a Grenade for too long.
Unlocked 28 Apr @ 1:53pm



Rare Specimen

Send the Hidden Hat to Xen.

Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.

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.

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.

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