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18 of 50 (36%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 21 Dec, 2016 @ 12:13pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 19 Sep, 2017 @ 7:42am

Convection Refinement

Ruin the microwave casserole.
Unlocked 21 Dec, 2016 @ 12:12pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 17 May, 2019 @ 10:03pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 19 Sep, 2017 @ 8:44am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 26 Jun, 2019 @ 10:32am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 9 Aug, 2020 @ 1:10pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 13 Dec, 2019 @ 10:34pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 23 Sep, 2017 @ 2:19pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 21 Dec, 2016 @ 12:10pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 17 May, 2019 @ 11:06pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 15 Aug, 2019 @ 4:54pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 9 Aug, 2021 @ 2:13pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 2 Feb, 2021 @ 5:04pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 3 Feb, 2021 @ 10:23am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 3 Feb, 2021 @ 12:31pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 3 Feb, 2021 @ 12:30pm

Well-Done

Cook a Grenade for too long.
Unlocked 30 Jan, 2021 @ 4:26pm



Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

Centripetal Attraction

Kill 20 Enemies with the Hivehand.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

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.

Inflammatory Actions

Kill a Headcrab using fire.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

Quantum Capacitance

Overcharge it anyway.

Remote Detonation

Kill a Barnacle with a Satchel.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Universal Gravitation

Get killed by your own Snarks.

Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

Our Brains And Your Brawn

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

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