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35 of 50 (70%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 11 Jun, 2015 @ 4:35am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 17 Aug, 2021 @ 6:55am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 17 Aug, 2021 @ 7:00am

Convection Refinement

Ruin the microwave casserole.
Unlocked 11 Jun, 2015 @ 4:34am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 17 Aug, 2021 @ 7:28pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 4 May, 2018 @ 9:51am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 12 Jun, 2015 @ 10:14am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 17 Aug, 2021 @ 10:16pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 22 Jan, 2020 @ 9:48pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 10 Jan @ 5:32pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 22 Jun, 2020 @ 8:21pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 16 Jul, 2016 @ 8:07am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 22 Jun, 2020 @ 9:26pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 17 Aug, 2021 @ 6:36am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 11 Jun, 2015 @ 4:28am

Quantum Capacitance

Overcharge it anyway.
Unlocked 3 May, 2018 @ 12:17pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 17 Aug, 2021 @ 10:48pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 17 Aug, 2021 @ 4:58pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 22 Aug, 2021 @ 12:17pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 17 Aug, 2021 @ 6:40am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 17 Aug, 2021 @ 9:09pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 22 Aug, 2021 @ 10:43am

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 22 Aug, 2021 @ 12:02pm

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 18 Aug, 2021 @ 7:39am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 17 Aug, 2021 @ 7:18am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 22 Aug, 2021 @ 12:13pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 18 Aug, 2021 @ 7:43am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 20 Aug, 2021 @ 5:26pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 19 Aug, 2021 @ 9:31pm

Contest Propellant

Find the snack supply canister.
Unlocked 22 Jun, 2020 @ 8:43pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 22 Jun, 2020 @ 8:40pm

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 22 Aug, 2021 @ 12:00pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 22 Jun, 2020 @ 10:26pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 24 Jun, 2020 @ 5:51pm

Well-Done

Cook a Grenade for too long.
Unlocked 17 Aug, 2021 @ 6:41am



Centripetal Attraction

Kill 20 Enemies with the Hivehand.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Futile Resistance

Kill 10 Enemies with Snarks.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

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.

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​.
+4

4 hidden achievements remaining

Details for each achievement will be revealed once unlocked