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23 of 50 (46%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 31 Jan, 2016 @ 1:26am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 25 Aug, 2019 @ 2:22am

Convection Refinement

Ruin the microwave casserole.
Unlocked 31 Jan, 2016 @ 1:25am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 12 Jan, 2022 @ 8:14am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 25 Aug, 2019 @ 2:23am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 27 Jun @ 11:57am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 20 Feb, 2016 @ 2:46am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 7 Feb, 2016 @ 12:32am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 20 Feb, 2016 @ 7:14am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 10 Dec, 2019 @ 12:56am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 20 Feb, 2016 @ 1:51am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 10 Dec, 2019 @ 4:58am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 6 Feb, 2016 @ 11:08am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 31 Jan, 2016 @ 1:22am

Quantum Capacitance

Overcharge it anyway.
Unlocked 5 Mar, 2016 @ 5:38am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 18 Sep, 2016 @ 4:31am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 31 Jan, 2016 @ 1:38am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 8 Feb, 2016 @ 3:43am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 11 Jan, 2022 @ 8:19am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 20 Jan, 2021 @ 11:51am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 4 Jan, 2021 @ 8:44am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 30 Mar, 2020 @ 9:06am

Well-Done

Cook a Grenade for too long.
Unlocked 8 Jan, 2022 @ 12:20am



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Centripetal Attraction

Kill 20 Enemies with the Hivehand.

Ethically Questionable

Conduct all of the questionable research experiments.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Rare Specimen

Send the Hidden Hat to Xen.

Universal Gravitation

Get killed by your own Snarks.

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​​.

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.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked