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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 23 Nov, 2016 @ 6:25pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 24 Nov, 2016 @ 2:03pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 21 Mar, 2020 @ 9:33am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 21 May, 2017 @ 7:55am

Convection Refinement

Ruin the microwave casserole.
Unlocked 23 Nov, 2016 @ 6:21pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 28 Feb, 2018 @ 4:29pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 8 Oct, 2017 @ 5:43pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 30 Nov, 2016 @ 12:25pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 3 Jan, 2018 @ 4:38pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 13 Dec, 2019 @ 4:22pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 17 Mar, 2020 @ 8:43am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 24 Nov, 2016 @ 3:39pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 2 Jan, 2018 @ 12:27pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 24 Nov, 2016 @ 3:28pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 2 Mar, 2018 @ 1:19pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 8 Oct, 2017 @ 6:25pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 21 Mar, 2020 @ 7:05pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 9 Oct, 2017 @ 5:29pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 5 Mar, 2018 @ 10:42am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 2 Jan, 2018 @ 12:26pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 14 Apr @ 10:53pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 21 Mar, 2020 @ 9:30am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 15 Mar, 2020 @ 8:34am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 21 Mar, 2020 @ 7:14pm

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 12 Apr @ 4:28pm

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 12 Apr @ 4:32pm

Contest Propellant

Find the snack supply canister.
Unlocked 14 Apr @ 9:48pm

Well-Done

Cook a Grenade for too long.
Unlocked 15 Mar, 2020 @ 8:43am



Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Futile Resistance

Kill 10 Enemies with Snarks.

Mega Hertz

Kill 5 Enemies with one Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

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​​.

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

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.

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.

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.
+4

4 hidden achievements remaining

Details for each achievement will be revealed once unlocked