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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 4 Oct, 2015 @ 9:39pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 4 Oct, 2015 @ 11:18pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 9 May, 2020 @ 4:28am

Convection Refinement

Ruin the microwave casserole.
Unlocked 4 Oct, 2015 @ 9:39pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 15 Mar, 2020 @ 4:58pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 6 Oct, 2015 @ 4:05pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 11 Dec, 2015 @ 8:03pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 9 Feb, 2016 @ 4:41pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 10 May, 2020 @ 12:33am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 8 Oct, 2015 @ 3:43am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 10 May, 2020 @ 9:51pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 17 Feb, 2016 @ 11:00pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 15 Mar, 2020 @ 3:17am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 10 May, 2020 @ 10:03pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 9 Oct, 2015 @ 2:01am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 10 May, 2020 @ 12:46am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 11 Mar, 2020 @ 6:57pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 10 May, 2020 @ 9:59pm

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 9 May, 2020 @ 5:03am

Contest Propellant

Find the snack supply canister.
Unlocked 9 May, 2020 @ 5:22am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 9 May, 2020 @ 5:19am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 10 May, 2020 @ 9:42pm

Well-Done

Cook a Grenade for too long.
Unlocked 15 Mar, 2020 @ 2:40am



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.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

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.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

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.
+5

5 hidden achievements remaining

Details for each achievement will be revealed once unlocked