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21 of 50 (42%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 26 Jul, 2020 @ 4:38am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 9 Aug, 2020 @ 3:17am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 9 Aug, 2020 @ 12:39am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 8 Aug, 2020 @ 12:59am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 8 Aug, 2020 @ 11:57pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 9 Aug, 2020 @ 2:17am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 17 Aug, 2020 @ 9:25am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 9 Aug, 2020 @ 12:45am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 2 Aug, 2020 @ 8:38am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 9 Aug, 2020 @ 1:11am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 10 May @ 1:15am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 9 Aug, 2020 @ 1:40am

Quantum Capacitance

Overcharge it anyway.
Unlocked 9 Aug, 2020 @ 1:09am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 10 May @ 3:57am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 10 May @ 1:08am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 5 Aug, 2020 @ 10:12am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 11 Aug, 2020 @ 11:34am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 9 May @ 2:36pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 10 May @ 3:54am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 10 May @ 3:53am

Well-Done

Cook a Grenade for too long.
Unlocked 2 Aug, 2020 @ 8:36am



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Convection Refinement

Ruin the microwave casserole.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Permeable Infrastructure

Use the alternate path in Office Complex.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

Rare Specimen

Send the Hidden Hat to Xen.

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Universal Gravitation

Get killed by your own Snarks.

Prolific Popper

Kill all Protozoans in the Borderworld.

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.

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.​
+7

7 hidden achievements remaining

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