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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 6 Sep, 2019 @ 8:24pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 7 Sep, 2019 @ 2:31pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 12 Dec, 2024 @ 6:48pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 8 Jun, 2021 @ 8:16pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 6 Sep, 2019 @ 8:22pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 6 Dec, 2022 @ 11:06am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 6 Dec, 2022 @ 7:42pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 13 Dec, 2024 @ 9:13am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 20 May, 2020 @ 5:05pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 7 Dec, 2022 @ 12:39pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 5 Dec, 2022 @ 8:31pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 7 Dec, 2022 @ 11:52am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 4 Jun, 2021 @ 4:10pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 5 Dec, 2022 @ 12:40pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 20 May, 2020 @ 5:18pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 7 Dec, 2022 @ 10:16am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 7 Jun, 2021 @ 11:31pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 5 Dec, 2022 @ 1:03pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 5 Dec, 2022 @ 1:00pm

Contest Propellant

Find the snack supply canister.
Unlocked 13 Jun, 2021 @ 12:18am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 13 Jun, 2021 @ 12:16am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 23 Oct, 2021 @ 12:57pm

Well-Done

Cook a Grenade for too long.
Unlocked 5 Dec, 2022 @ 9:11pm



Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

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.

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​.

Late for Work

Defeat Nihilanth in under 4 minutes.​

Rather an Anticlimax

Decline G-Man’s offer of employment.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked