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18 of 50 (36%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 2 May, 2020 @ 2:21pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 4 May, 2020 @ 6:58pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 8 May, 2020 @ 10:43pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 11 May, 2020 @ 8:34pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 2 May, 2020 @ 2:20pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 9 May, 2020 @ 2:19pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 9 May, 2020 @ 6:09pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 4 May, 2020 @ 7:17pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 16 May, 2020 @ 12:12am

Quantum Capacitance

Overcharge it anyway.
Unlocked 16 May, 2020 @ 12:16am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 11 May, 2020 @ 7:51pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 16 May, 2020 @ 12:04am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 10 May, 2020 @ 5:12pm

Following the Rules

Use the welcome mat.
Unlocked 11 May, 2020 @ 8:06pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 14 May, 2020 @ 5:03pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 15 May, 2020 @ 5:46pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 16 May, 2020 @ 12:33am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 16 May, 2020 @ 12:34am



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.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

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.

Permeable Infrastructure

Use the alternate path in Office Complex.

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.

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.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

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.​

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.​

Well-Done

Cook a Grenade for too long.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked