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23 of 50 (46%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Aug 23, 2017 @ 6:18pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Aug 24, 2017 @ 9:01am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Nov 29, 2020 @ 6:01pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Mar 15, 2020 @ 5:57pm

Convection Refinement

Ruin the microwave casserole.
Unlocked Aug 23, 2017 @ 6:17pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Aug 24, 2017 @ 1:48pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Mar 15, 2020 @ 11:30am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Aug 24, 2017 @ 9:08pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Aug 22, 2017 @ 9:03am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Mar 15, 2020 @ 5:57pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Jun 29, 2019 @ 7:38pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Aug 22, 2017 @ 9:10pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Mar 16, 2020 @ 10:42am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Aug 23, 2017 @ 6:11pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Mar 17, 2020 @ 10:57am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Dec 1, 2020 @ 8:57pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked Nov 30, 2020 @ 8:12pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked Mar 16, 2020 @ 1:21pm

Contest Propellant

Find the snack supply canister.
Unlocked Dec 4, 2020 @ 6:20pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Mar 15, 2020 @ 10:02pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked Dec 5, 2020 @ 6:50pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Mar 16, 2020 @ 11:33am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked Mar 16, 2020 @ 11:34am



Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Futile Resistance

Kill 10 Enemies with Snarks.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.

Quantum Capacitance

Overcharge it anyway.

Rare Specimen

Send the Hidden Hat to Xen.

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.

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​​.

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.

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.

Well-Done

Cook a Grenade for too long.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked