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31 of 50 (62%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 27 Dec, 2016 @ 1:40am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 27 Dec, 2016 @ 3:26am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 12 Mar, 2017 @ 10:35pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 29 Jun, 2019 @ 1:29pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 27 Dec, 2016 @ 1:35am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 13 Mar, 2017 @ 1:00pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 26 Jun, 2019 @ 9:53am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 26 Jun, 2019 @ 5:21pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 26 Jun, 2019 @ 6:09pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 6 Mar, 2017 @ 5:57pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 13 Mar, 2017 @ 1:22pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 27 Dec, 2016 @ 2:30am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 26 Jun, 2019 @ 2:13pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 26 Jun, 2019 @ 2:07pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 29 Jun, 2019 @ 7:16am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 25 Jun, 2019 @ 5:42pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 30 Jun, 2019 @ 6:45pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 6 Mar, 2017 @ 6:04pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 27 Dec, 2016 @ 1:25am

Quantum Capacitance

Overcharge it anyway.
Unlocked 12 Mar, 2017 @ 6:37pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 1 Jul, 2019 @ 5:44pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 12 Mar, 2017 @ 10:36pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 27 Dec, 2016 @ 1:57am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 26 Jun, 2019 @ 4:13am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 12 Mar, 2017 @ 6:39pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 3 Apr, 2020 @ 4:07am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 3 Apr, 2020 @ 4:38am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 3 Apr, 2020 @ 5:29am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 3 Apr, 2020 @ 3:26am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 3 Apr, 2020 @ 5:48am

Well-Done

Cook a Grenade for too long.
Unlocked 3 Apr, 2020 @ 3:29am



Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

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.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked