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14 of 50 (28%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Jul 1, 2023 @ 3:57am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Dec 26, 2019 @ 10:41am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Jul 1, 2023 @ 4:31am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Jan 19, 2020 @ 9:59am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Jan 23, 2020 @ 10:54am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Dec 7, 2019 @ 4:08am

Quantum Capacitance

Overcharge it anyway.
Unlocked Dec 18, 2019 @ 9:33am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Jan 19, 2020 @ 10:05am

Universal Gravitation

Get killed by your own Snarks.
Unlocked Jul 8, 2023 @ 1:58am

Following the Rules

Use the welcome mat.
Unlocked Jul 11, 2023 @ 9:35am

Contest Propellant

Find the snack supply canister.
Unlocked Jul 16, 2023 @ 5:05am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Jul 16, 2023 @ 5:03am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Jul 16, 2023 @ 7:50am

Well-Done

Cook a Grenade for too long.
Unlocked Jul 4, 2023 @ 5:49am



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

Centripetal Attraction

Kill 20 Enemies with the Hivehand.

Convection Refinement

Ruin the microwave casserole.

Dead Reckoning

Kill an Assassin with the .357 Magnum.

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.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Permeable Infrastructure

Use the alternate path in Office Complex.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

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.

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.

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.
+5

5 hidden achievements remaining

Details for each achievement will be revealed once unlocked