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17 of 50 (34%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 4 Jun, 2015 @ 7:16am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 4 Jun, 2015 @ 12:34pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 2 Oct, 2019 @ 10:10am

Convection Refinement

Ruin the microwave casserole.
Unlocked 4 Jun, 2015 @ 7:15am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 4 Jun, 2015 @ 12:36pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 17 Apr, 2018 @ 2:24pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 23 Nov, 2016 @ 2:41pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 11 Dec, 2022 @ 3:59am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 4 Jun, 2015 @ 7:49am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 4 Jun, 2015 @ 7:13am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 27 Nov, 2016 @ 10:45am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 11 Dec, 2022 @ 7:59am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 11 Dec, 2022 @ 4:12am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 11 Dec, 2022 @ 4:07am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 11 Dec, 2022 @ 8:27am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 11 Dec, 2022 @ 8:28am

Well-Done

Cook a Grenade for too long.
Unlocked 8 Dec, 2022 @ 8:17am



Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

Dead Reckoning

Kill an Assassin with the .357 Magnum.

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.

Quantum Capacitance

Overcharge it anyway.

Rare Specimen

Send the Hidden Hat to Xen.

Remote Detonation

Kill a Barnacle with a Satchel.

Resonance Procrastinator

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

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

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.

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

Details for each achievement will be revealed once unlocked