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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Nov 2, 2019 @ 6:40am

Convection Refinement

Ruin the microwave casserole.
Unlocked Nov 2, 2019 @ 6:39am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Jul 29, 2024 @ 7:55am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Dec 14, 2019 @ 12:21pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked Dec 12, 2019 @ 3:49pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Nov 2, 2019 @ 7:31am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Jul 30, 2024 @ 5:22am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Nov 23, 2019 @ 1:39pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Dec 14, 2019 @ 11:51am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Jul 30, 2024 @ 4:53am

Universal Gravitation

Get killed by your own Snarks.
Unlocked Jul 29, 2024 @ 8:55am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked Jul 30, 2024 @ 8:26am

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked Jul 30, 2024 @ 9:13am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked Jul 29, 2024 @ 3:57pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked Jul 29, 2024 @ 3:32am

Contest Propellant

Find the snack supply canister.
Unlocked Jul 30, 2024 @ 5:46am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked Jul 30, 2024 @ 5:44am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked Jul 30, 2024 @ 9:13am



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.

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.

Inflammatory Actions

Kill a Headcrab using fire.

Mega Hertz

Kill 5 Enemies with one Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

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.

Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

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.

Well-Done

Cook a Grenade for too long.
+5

5 hidden achievements remaining

Details for each achievement will be revealed once unlocked