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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 22 Jun, 2017 @ 7:27pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 22 Jun, 2017 @ 8:53pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 24 Dec, 2018 @ 11:33pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 25 Jun, 2017 @ 12:53am

Convection Refinement

Ruin the microwave casserole.
Unlocked 22 Jun, 2017 @ 7:26pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 25 Dec, 2018 @ 1:58am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 24 Dec, 2018 @ 10:52pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 25 Dec, 2018 @ 2:15am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 28 Nov, 2023 @ 3:53am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 24 Dec, 2018 @ 11:18pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 23 Jun, 2017 @ 9:20pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 22 Jun, 2017 @ 7:19pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 23 Jun, 2017 @ 9:15pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 25 Dec, 2018 @ 2:18am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 22 Jun, 2017 @ 7:45pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 25 Dec, 2018 @ 2:00am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 2 Dec, 2023 @ 10:38pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 17 Nov, 2024 @ 10:54pm



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.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

Permeable Infrastructure

Use the alternate path in Office Complex.

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.

Rare Specimen

Send the Hidden Hat to Xen.

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​​.

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.​

Limitless Potential

Accept G-Man’s offer of employment.

Rather an Anticlimax

Decline G-Man’s offer of employment.

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

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