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25 of 50 (50%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked Dec 28, 2019 @ 8:08am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked Dec 27, 2019 @ 3:08pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked Dec 22, 2019 @ 8:48am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked Dec 25, 2019 @ 1:51pm

Convection Refinement

Ruin the microwave casserole.
Unlocked Dec 20, 2019 @ 10:41am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked Dec 28, 2019 @ 12:48pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked Jan 10, 2020 @ 10:20am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked Jan 6, 2020 @ 1:08pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked Dec 25, 2019 @ 2:00pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked Dec 21, 2019 @ 1:47pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked Jan 4, 2020 @ 6:13am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked Jan 13, 2020 @ 8:39am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked Jan 7, 2020 @ 7:57am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked Jan 3, 2020 @ 9:29am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked Jan 7, 2020 @ 6:11am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked Jan 2, 2020 @ 11:12am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked Dec 26, 2019 @ 7:03am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked Jan 13, 2020 @ 8:52am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked Jan 4, 2020 @ 8:43am

Quantum Capacitance

Overcharge it anyway.
Unlocked Dec 22, 2019 @ 8:08am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked Jan 9, 2020 @ 10:47am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked Jan 5, 2020 @ 2:21pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked Jan 4, 2020 @ 9:23am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked Jan 4, 2020 @ 6:25am

Universal Gravitation

Get killed by your own Snarks.
Unlocked Dec 23, 2019 @ 5:33am



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.

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.

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.

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked