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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 4 Jul, 2017 @ 7:57am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 16 Mar, 2020 @ 10:38am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 16 Mar, 2020 @ 11:08am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 24 Jun, 2020 @ 10:40pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 4 Jul, 2017 @ 7:57am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 13 Sep, 2023 @ 3:03pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 24 Jun, 2020 @ 9:18pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 4 Jul, 2017 @ 1:56pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 15 Feb, 2019 @ 12:35pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 24 Jul, 2017 @ 9:52pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 28 Jun, 2020 @ 8:59am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 4 Jul, 2017 @ 8:43am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 28 Jun, 2020 @ 9:22am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 4 Jul, 2017 @ 7:54am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 24 Jul, 2017 @ 9:42pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 15 Mar, 2020 @ 1:23am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 28 Jun, 2020 @ 11:46am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 14 Sep, 2023 @ 4:35pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 13 Sep, 2023 @ 11:45am

Contest Propellant

Find the snack supply canister.
Unlocked 14 Sep, 2023 @ 10:59am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 14 Sep, 2023 @ 10:57am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 14 Sep, 2023 @ 4:56pm

Well-Done

Cook a Grenade for too long.
Unlocked 16 Mar, 2020 @ 11:06am



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.

Universal Gravitation

Get killed by your own Snarks.

Prolific Popper

Kill all Protozoans 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.

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