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30 of 50 (60%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 21 May, 2021 @ 10:57pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 1 Jan @ 1:42am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 26 Mar @ 12:33am

Convection Refinement

Ruin the microwave casserole.
Unlocked 21 May, 2021 @ 10:54pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 22 May, 2021 @ 3:58pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 26 Mar @ 1:52am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 26 Mar @ 1:50am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 29 May, 2021 @ 2:37pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 25 Mar @ 9:38pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 18 Oct, 2024 @ 3:32am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 26 Mar @ 12:58am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 21 May, 2023 @ 3:12am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 26 Mar @ 1:01am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 18 Oct, 2024 @ 4:31am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 1 Jan @ 4:32am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 21 May, 2023 @ 3:12am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 21 May, 2021 @ 10:46pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 1 Jan @ 4:00am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 26 Mar @ 12:33am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 25 Mar @ 9:27pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 30 Jul, 2022 @ 10:53pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 30 Jul, 2022 @ 3:34pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 26 Mar @ 1:29am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 26 Mar @ 2:04am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 26 Mar @ 12:44am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 26 Mar @ 2:10am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 21 May, 2023 @ 8:12pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 1 Jan @ 4:32am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 1 Jan @ 4:37am

Well-Done

Cook a Grenade for too long.
Unlocked 26 Mar @ 12:56am



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Ethically Questionable

Conduct all of the questionable research experiments.

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.

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.

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.​
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked