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28 of 50 (56%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 25 Dec, 2016 @ 6:58pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 7 Oct, 2021 @ 1:18am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 7 Oct, 2021 @ 1:57am

Convection Refinement

Ruin the microwave casserole.
Unlocked 25 Dec, 2016 @ 6:56pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 23 Sep, 2021 @ 9:15am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 23 Sep, 2021 @ 10:55am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 23 Sep, 2021 @ 3:23pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 7 Oct, 2021 @ 2:32am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 7 Oct, 2021 @ 12:24am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 20 Sep, 2021 @ 9:27am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 23 Sep, 2021 @ 3:20pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 20 Sep, 2021 @ 11:01am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 13 Dec, 2021 @ 8:53am

Quantum Capacitance

Overcharge it anyway.
Unlocked 23 Sep, 2021 @ 10:36am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 23 Sep, 2021 @ 8:56am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 13 Dec, 2021 @ 9:08am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 6 Oct, 2021 @ 11:41pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 7 Oct, 2021 @ 6:05am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 20 Sep, 2021 @ 12:10pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 23 Sep, 2021 @ 2:15pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 13 Dec, 2021 @ 9:10am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 7 Oct, 2021 @ 12:15am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 7 Oct, 2021 @ 2:18am

Contest Propellant

Find the snack supply canister.
Unlocked 7 Oct, 2021 @ 4:05am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 7 Oct, 2021 @ 4:00am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 7 Oct, 2021 @ 6:34am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 7 Oct, 2021 @ 6:43am

Well-Done

Cook a Grenade for too long.
Unlocked 20 Sep, 2021 @ 11:59am



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

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.

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.

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.

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.

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