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27 of 50 (54%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Dec 24, 2015 @ 9:48am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Dec 27, 2015 @ 8:55am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Dec 24, 2015 @ 2:31pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Jan 27, 2016 @ 7:28pm

Convection Refinement

Ruin the microwave casserole.
Unlocked Dec 24, 2015 @ 9:47am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Jan 26, 2016 @ 9:07pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked Dec 24, 2015 @ 3:06pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Jan 27, 2016 @ 9:29am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked Jan 28, 2016 @ 4:23pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Dec 24, 2015 @ 11:18am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Jan 27, 2016 @ 8:11pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Dec 27, 2015 @ 8:56am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked Jan 28, 2016 @ 12:40pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Jan 28, 2016 @ 12:59pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Jan 27, 2016 @ 2:07pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Dec 27, 2015 @ 9:06am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Jan 27, 2016 @ 8:06pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Dec 24, 2015 @ 10:50am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Dec 27, 2015 @ 8:16am

Quantum Capacitance

Overcharge it anyway.
Unlocked Jan 27, 2016 @ 9:31am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked Jan 28, 2016 @ 7:41pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Dec 24, 2015 @ 2:56pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked Dec 27, 2015 @ 8:51am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Jan 28, 2016 @ 11:31am

Universal Gravitation

Get killed by your own Snarks.
Unlocked Jan 27, 2016 @ 7:33pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Apr 5, 2023 @ 5:25pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Apr 5, 2023 @ 5:26pm



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.​

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked