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40 of 50 (80%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 29 Jun, 2017 @ 12:22am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 30 Sep, 2017 @ 7:47pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 8 Oct, 2017 @ 6:32pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 13 Jul, 2017 @ 4:29pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 13 Jul, 2017 @ 6:51pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 13 Jul, 2017 @ 5:23pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 29 Jun, 2017 @ 4:20am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 4 Jul, 2017 @ 3:16am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 29 Jun, 2017 @ 4:29am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 13 Jul, 2017 @ 5:33pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 23 Sep, 2017 @ 10:11pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 30 Sep, 2017 @ 8:13pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 9 Oct, 2017 @ 4:33pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 10 Oct, 2017 @ 12:23am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 29 Jun, 2017 @ 3:35am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 14 Oct, 2017 @ 6:35pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 13 Jul, 2017 @ 4:44pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 8 Oct, 2017 @ 5:51pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 4 Jul, 2017 @ 3:19am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 7 Jul, 2021 @ 12:12am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 10 Oct, 2017 @ 12:22am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 8 Oct, 2017 @ 6:14pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 13 Jul, 2017 @ 4:24pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 17 Apr, 2022 @ 4:54am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 18 Apr, 2022 @ 5:12am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 18 Apr, 2022 @ 2:42am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 18 Apr, 2022 @ 2:19am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 18 Apr, 2022 @ 1:50am

Following the Rules

Use the welcome mat.
Unlocked 18 Apr, 2022 @ 5:32am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 16 Apr, 2022 @ 8:28am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 18 Apr, 2022 @ 2:11am

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 18 Apr, 2022 @ 6:52am

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 18 Apr, 2022 @ 6:53am

Contest Propellant

Find the snack supply canister.
Unlocked 18 Apr, 2022 @ 2:08am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 16 Apr, 2022 @ 8:38am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 18 Apr, 2022 @ 5:23am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 18 Apr, 2022 @ 5:24am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 17 Apr, 2022 @ 5:27am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 17 Apr, 2022 @ 5:26am

Well-Done

Cook a Grenade for too long.
Unlocked 16 Apr, 2022 @ 8:01am



Futile Resistance

Kill 10 Enemies with Snarks.

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​​.

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.
+3

3 hidden achievements remaining

Details for each achievement will be revealed once unlocked