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26 of 50 (52%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 19 Oct, 2015 @ 2:31am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 20 Jul, 2019 @ 1:08pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 7 Jan, 2018 @ 1:57pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 7 Jan, 2018 @ 5:18pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 19 Oct, 2015 @ 2:30am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 7 Jan, 2018 @ 3:14pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 7 Jan, 2018 @ 1:25pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 7 Jan, 2018 @ 4:05pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 7 Jan, 2018 @ 2:25pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 7 Jan, 2018 @ 6:26pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 19 Nov, 2016 @ 1:24pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 7 Mar, 2020 @ 6:15am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 7 Jan, 2018 @ 4:20pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 6 Jan, 2018 @ 3:00pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 28 Dec, 2019 @ 9:16am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 28 Dec, 2019 @ 9:13am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 19 Oct, 2015 @ 2:26am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 14 Mar, 2020 @ 5:19am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 19 Oct, 2015 @ 2:41am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 8 Jan, 2022 @ 4:55am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 14 Mar, 2020 @ 3:17pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 8 Mar, 2020 @ 1:12pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 14 Mar, 2020 @ 8:55am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 14 Mar, 2020 @ 3:52pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 14 Mar, 2020 @ 3:52pm

Well-Done

Cook a Grenade for too long.
Unlocked 8 Jan, 2022 @ 3:37am



Futile Resistance

Kill 10 Enemies with Snarks.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Quantum Capacitance

Overcharge it anyway.

Remote Detonation

Kill a Barnacle with a Satchel.

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.​
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked