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24 of 50 (48%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 10 Dec, 2015 @ 2:01pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 10 Dec, 2015 @ 5:24pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 17 Dec, 2015 @ 7:00pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 12 Dec, 2015 @ 5:37pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 10 Dec, 2015 @ 2:00pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 11 Dec, 2015 @ 8:56am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 11 Mar, 2020 @ 3:57pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 23 Dec, 2015 @ 7:49am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 10 Dec, 2015 @ 6:00pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 12 Dec, 2015 @ 2:24pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 3 Dec, 2023 @ 2:59pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 12 Dec, 2015 @ 3:37pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 10 Dec, 2015 @ 6:33pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 12 Dec, 2015 @ 3:52pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 10 Dec, 2015 @ 5:07pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 11 Dec, 2015 @ 9:09am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 10 Nov, 2022 @ 5:41am

Quantum Capacitance

Overcharge it anyway.
Unlocked 11 Dec, 2015 @ 6:33am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 12 Dec, 2015 @ 6:33pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 10 Dec, 2015 @ 2:16pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 10 Nov, 2022 @ 6:33am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 14 Mar, 2020 @ 4:59pm

Contest Propellant

Find the snack supply canister.
Unlocked 11 Nov, 2022 @ 6:47pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 11 Nov, 2022 @ 6:45pm



Futile Resistance

Kill 10 Enemies with Snarks.

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.

Rare Specimen

Send the Hidden Hat to Xen.

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​​.

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.​

Limitless Potential

Accept G-Man’s offer of employment.

Rather an Anticlimax

Decline G-Man’s offer of employment.

Well-Done

Cook a Grenade for too long.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked