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26 of 50 (52%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Jul 4, 2016 @ 9:02am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Jul 4, 2016 @ 9:31am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Jul 5, 2016 @ 9:17am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Jan 1, 2017 @ 3:12am

Convection Refinement

Ruin the microwave casserole.
Unlocked Jul 4, 2016 @ 9:00am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Jul 7, 2016 @ 6:49am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked Jul 5, 2016 @ 4:30am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Jul 12, 2016 @ 9:06am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Jul 5, 2016 @ 4:06am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Jan 2, 2017 @ 9:00am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Mar 9, 2020 @ 11:13am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked Jul 12, 2016 @ 8:52am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Jul 12, 2016 @ 9:05am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Dec 30, 2016 @ 3:28am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Dec 3, 2023 @ 6:55am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Jan 2, 2017 @ 9:08am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Jul 5, 2016 @ 8:41am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Jul 4, 2016 @ 8:58am

Quantum Capacitance

Overcharge it anyway.
Unlocked Jul 12, 2016 @ 9:03am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Jul 6, 2016 @ 4:39am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked Jul 4, 2016 @ 9:16am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Dec 5, 2023 @ 2:41am

Universal Gravitation

Get killed by your own Snarks.
Unlocked Jul 12, 2016 @ 8:57am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked Dec 5, 2023 @ 6:35am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked Dec 2, 2023 @ 6:50am

Well-Done

Cook a Grenade for too long.
Unlocked Dec 3, 2023 @ 7:10am



Futile Resistance

Kill 10 Enemies with Snarks.

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.

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.

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.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked