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21 of 50 (42%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Nov 25, 2015 @ 12:45pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Nov 25, 2015 @ 1:12pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Dec 2, 2015 @ 11:03am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Apr 16, 2016 @ 10:03am

Convection Refinement

Ruin the microwave casserole.
Unlocked Nov 25, 2015 @ 12:42pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Dec 13, 2015 @ 5:30am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked Dec 18, 2015 @ 10:10am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Dec 8, 2015 @ 6:10am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Dec 8, 2015 @ 6:26am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Dec 13, 2015 @ 6:32am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Jan 14, 2016 @ 7:53am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Dec 8, 2015 @ 6:39am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Nov 26, 2015 @ 8:21am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Dec 13, 2015 @ 5:45am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Nov 26, 2015 @ 9:05am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Nov 25, 2015 @ 12:40pm

Quantum Capacitance

Overcharge it anyway.
Unlocked Dec 8, 2015 @ 6:35am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked Apr 16, 2016 @ 10:46am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Dec 25, 2015 @ 9:28am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked Nov 25, 2015 @ 12:58pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked Aug 6, 2023 @ 10:26am



Futile Resistance

Kill 10 Enemies with Snarks.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

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.

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.

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