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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 22 Dec, 2017 @ 5:09pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 2 Jan, 2018 @ 7:23pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 19 Aug, 2020 @ 9:55pm

Centripetal Attraction

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

Convection Refinement

Ruin the microwave casserole.
Unlocked 22 Dec, 2017 @ 5:08pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 20 Aug, 2020 @ 1:06am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 19 Aug, 2020 @ 8:43pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 20 Aug, 2020 @ 1:53am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 2 Jan, 2018 @ 7:24pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 21 Aug, 2020 @ 3:56am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 21 Aug, 2020 @ 2:36am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 21 Aug, 2020 @ 8:14am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 2 Jan, 2018 @ 7:17pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 2 Jan, 2018 @ 6:59pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 19 Aug, 2020 @ 10:56pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 2 Jan, 2018 @ 7:11pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 22 Aug, 2020 @ 12:26am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 21 Aug, 2020 @ 7:11am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 22 Aug, 2020 @ 1:17am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 22 Aug, 2020 @ 1:10am

Well-Done

Cook a Grenade for too long.
Unlocked 21 Aug, 2020 @ 3:01am



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.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Permeable Infrastructure

Use the alternate path in Office Complex.

Rare Specimen

Send the Hidden Hat to Xen.

Remote Detonation

Kill a Barnacle with a Satchel.

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.

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.

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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