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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked May 27, 2017 @ 11:03am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked May 28, 2017 @ 11:56am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Jun 3, 2017 @ 11:35am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Jun 15, 2017 @ 3:14pm

Convection Refinement

Ruin the microwave casserole.
Unlocked May 27, 2017 @ 11:01am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Jun 6, 2017 @ 12:40pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked May 28, 2017 @ 2:39pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Jun 8, 2017 @ 3:10pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked Jun 21, 2017 @ 10:56am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Jun 6, 2017 @ 11:49am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Jun 16, 2017 @ 2:46am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Jun 16, 2017 @ 4:25am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked Jun 21, 2017 @ 11:50am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Jun 21, 2017 @ 1:59pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Jun 21, 2017 @ 11:18am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked May 28, 2017 @ 2:26pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Jun 16, 2017 @ 2:42am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Jun 3, 2017 @ 11:28am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked May 28, 2017 @ 12:01pm

Quantum Capacitance

Overcharge it anyway.
Unlocked Jun 8, 2017 @ 2:32pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked Jun 21, 2017 @ 3:48pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked May 30, 2017 @ 2:55pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked May 27, 2017 @ 1:27pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Jun 16, 2017 @ 1:13pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked Jun 8, 2017 @ 2:28pm



Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

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.​

Limitless Potential

Accept G-Man’s offer of employment.

Rather an Anticlimax

Decline G-Man’s offer of employment.

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked