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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 6 Aug, 2017 @ 1:15pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 30 Sep, 2017 @ 10:44am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 21 Nov @ 8:51pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 24 Nov @ 6:42pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 6 Aug, 2017 @ 1:15pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 22 Nov @ 6:08pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 21 Nov @ 4:59pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 23 Nov @ 4:31pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 23 Nov @ 4:25pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 1 Oct, 2017 @ 2:49pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 21 Nov @ 11:47am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 21 Nov @ 5:14pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 21 Nov @ 11:57am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 20 Aug, 2018 @ 12:21pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 25 Nov @ 11:49am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 30 Aug, 2017 @ 10:52am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 21 Nov @ 11:20am

Quantum Capacitance

Overcharge it anyway.
Unlocked 15 Sep, 2020 @ 9:32am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 3 Sep, 2017 @ 3:38pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 6 Aug, 2017 @ 1:26pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 21 Nov @ 8:49pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 15 Sep, 2020 @ 9:28am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 22 Nov @ 12:00pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 25 Nov @ 10:19am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 21 Nov @ 4:47pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 21 Nov @ 11:32am

Well-Done

Cook a Grenade for too long.
Unlocked 21 Nov @ 11:58am



Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Rare Specimen

Send the Hidden Hat to Xen.

Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

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.

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