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28 of 50 (56%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 4 Oct, 2017 @ 7:12am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 19 Jan, 2018 @ 6:01am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 24 Jun, 2022 @ 8:50am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 23 Sep, 2017 @ 8:17am

Convection Refinement

Ruin the microwave casserole.
Unlocked 19 Sep, 2017 @ 4:38am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 24 Jun, 2022 @ 8:03am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 24 Jun, 2022 @ 11:36am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 24 Jun, 2022 @ 11:59pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 24 Sep, 2017 @ 7:09am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 25 Jun, 2022 @ 12:47am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 24 Jun, 2022 @ 6:55am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 24 Jun, 2022 @ 8:10am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 24 Jun, 2022 @ 7:31am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 24 Jun, 2022 @ 10:40pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 24 Jun, 2022 @ 7:29am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 25 Jun, 2022 @ 12:44am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 24 Jun, 2022 @ 7:00am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 19 Jan, 2018 @ 12:59am

Quantum Capacitance

Overcharge it anyway.
Unlocked 24 Jun, 2022 @ 11:34am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 24 Jun, 2022 @ 8:31am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 24 Jun, 2022 @ 6:37am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 24 Jun, 2022 @ 11:28am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 26 Jun, 2022 @ 8:51am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 24 Jun, 2022 @ 8:51am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 24 Jun, 2022 @ 11:41pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 26 Jun, 2022 @ 7:30am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 26 Jun, 2022 @ 9:05am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 26 Jun, 2022 @ 9:07am



Dead Reckoning

Kill an Assassin with the .357 Magnum.

Rare Specimen

Send the Hidden Hat to Xen.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Prolific Popper

Kill all Protozoans in the Borderworld.

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.​

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked