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27 of 50 (54%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 29 Dec, 2018 @ 6:30am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 2 Jan, 2019 @ 8:29am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 26 Mar, 2019 @ 4:21am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 3 Jan, 2019 @ 4:36am

Convection Refinement

Ruin the microwave casserole.
Unlocked 30 Dec, 2018 @ 2:30am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 26 Mar, 2019 @ 5:06am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 27 Mar, 2019 @ 10:29am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 30 Dec, 2018 @ 6:25am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 5 Jul, 2020 @ 11:10am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 4 Jan, 2019 @ 12:46pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 30 Dec, 2018 @ 5:14am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 26 Mar, 2019 @ 4:07am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 15 May, 2020 @ 10:00am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 5 Jul, 2020 @ 11:46am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 26 Mar, 2019 @ 5:22am

Quantum Capacitance

Overcharge it anyway.
Unlocked 1 Jan, 2019 @ 12:32pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 7 Jan, 2019 @ 10:58am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 26 Mar, 2019 @ 4:55am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 24 Mar, 2020 @ 8:49am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 26 Dec, 2019 @ 12:03pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 9 Aug, 2020 @ 8:43am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 3 Apr, 2020 @ 11:51am

Contest Propellant

Find the snack supply canister.
Unlocked 5 Jul, 2020 @ 12:22pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 5 Jul, 2020 @ 12:21pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 9 Aug, 2020 @ 9:38am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 9 Aug, 2020 @ 9:37am

Well-Done

Cook a Grenade for too long.
Unlocked 24 Mar, 2020 @ 10:02am



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.

Permeable Infrastructure

Use the alternate path in Office Complex.

Universal Gravitation

Get killed by your own Snarks.

Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

Our Brains And Your Brawn

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

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

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.​
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked