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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 14 Mar, 2020 @ 4:50pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 16 Mar, 2020 @ 11:46am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 15 Mar, 2020 @ 3:11pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 22 Mar, 2020 @ 4:56pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 21 Mar, 2020 @ 12:18pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 16 Mar, 2020 @ 4:18pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 21 Mar, 2020 @ 12:56pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 28 May, 2020 @ 3:20pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 21 May, 2020 @ 8:18pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 11 Mar, 2017 @ 5:31pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 21 May, 2020 @ 8:45pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 21 Mar, 2020 @ 11:42pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 22 Mar, 2020 @ 12:15am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 23 May, 2020 @ 12:43am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 21 Mar, 2020 @ 11:51am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 21 Mar, 2020 @ 11:54pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 21 May, 2020 @ 8:41pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 17 Mar, 2017 @ 2:21pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 21 Mar, 2020 @ 1:04pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 21 May, 2020 @ 8:10pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 16 Mar, 2020 @ 12:21pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 21 May, 2020 @ 9:02pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 28 May, 2020 @ 2:41pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 19 Mar, 2020 @ 11:17pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 22 Mar, 2020 @ 1:21am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 22 Mar, 2020 @ 9:05pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 28 May, 2020 @ 2:50pm

Well-Done

Cook a Grenade for too long.
Unlocked 14 Mar, 2020 @ 11:17pm



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.

Our Brains And Your Brawn

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

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