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18 of 50 (36%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 25 Jan, 2024 @ 7:36pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 3 May, 2024 @ 2:15pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 17 Jan @ 8:47pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 1 Jan, 2024 @ 1:18pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 30 Dec, 2023 @ 2:42pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 18 May, 2024 @ 1:41pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 18 May, 2024 @ 6:55pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 30 Dec, 2023 @ 3:40pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 3 May, 2024 @ 1:57pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 30 Jun, 2024 @ 1:22pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 6 Jan @ 7:04am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 30 Jun, 2024 @ 1:29pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 20 May, 2024 @ 4:19pm

Contest Propellant

Find the snack supply canister.
Unlocked 30 Jun, 2024 @ 11:11am

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 30 Jun, 2024 @ 1:29pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 30 Jun, 2024 @ 11:10am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 30 Jun, 2024 @ 2:02pm

Well-Done

Cook a Grenade for too long.
Unlocked 30 Dec, 2023 @ 7:35pm



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.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

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.

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.

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.

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.

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