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24 of 50 (48%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Mar 11, 2017 @ 4:49am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Mar 11, 2017 @ 5:17am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Apr 2, 2018 @ 11:49pm

Convection Refinement

Ruin the microwave casserole.
Unlocked Mar 11, 2017 @ 4:47am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Aug 12, 2021 @ 1:04am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked Aug 8, 2021 @ 11:14pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Aug 14, 2021 @ 9:57pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked Apr 8, 2018 @ 11:32pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Jun 18, 2017 @ 6:01pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Aug 8, 2021 @ 10:28pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked Aug 9, 2021 @ 3:39am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Mar 19, 2018 @ 2:55am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Mar 25, 2020 @ 10:10pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Apr 11, 2018 @ 8:40am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Jan 27, 2018 @ 3:57am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Mar 12, 2020 @ 3:50am

Quantum Capacitance

Overcharge it anyway.
Unlocked Feb 4, 2018 @ 6:33am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked Feb 14, 2018 @ 2:04am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Aug 8, 2021 @ 9:52pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked Feb 4, 2018 @ 6:48am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked Aug 14, 2021 @ 9:53pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked Aug 8, 2021 @ 11:04pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked Mar 12, 2020 @ 4:06am

Well-Done

Cook a Grenade for too long.
Unlocked Mar 12, 2020 @ 4:36am



Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Mega Hertz

Kill 5 Enemies with one Grenade.

Rare Specimen

Send the Hidden Hat to Xen.

Remote Detonation

Kill a Barnacle with a Satchel.

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.

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