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15 of 50 (30%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 29 Jun, 2018 @ 4:49am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 27 Jun, 2019 @ 5:34pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 25 Jun, 2018 @ 7:12am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 26 Jun, 2018 @ 7:05am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 21 Jul, 2018 @ 8:45pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 5 Jul, 2018 @ 4:41am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 11 Oct, 2022 @ 10:34pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 18 Jun, 2022 @ 9:04am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 25 Jun, 2018 @ 11:42am

Quantum Capacitance

Overcharge it anyway.
Unlocked 31 Jul, 2020 @ 11:50am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 27 Nov, 2019 @ 1:07am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 6 Jun, 2022 @ 7:34am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 31 Oct, 2018 @ 1:28am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 16 Jun, 2022 @ 12:16pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 18 Jun, 2022 @ 10:38am



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Inflammatory Actions

Kill a Headcrab using fire.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

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.

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.

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.​

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