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19 of 50 (38%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 8 May, 2017 @ 3:34pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 8 May, 2017 @ 4:36pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 6 Jan, 2021 @ 12:20pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 5 Jan, 2021 @ 3:03pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 6 Jan, 2021 @ 3:10pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 6 Jan, 2021 @ 12:35pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 6 Jan, 2021 @ 4:05pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 9 May, 2017 @ 8:45am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 6 Jan, 2021 @ 11:50am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 6 Jan, 2021 @ 12:44pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 6 Jan, 2021 @ 11:38am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 7 Jan, 2021 @ 1:24pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 6 Jan, 2021 @ 12:00pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 8 May, 2017 @ 5:20pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 13 May, 2017 @ 4:04pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 6 Jan, 2021 @ 1:19pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 9 May, 2017 @ 12:13pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 6 Jan, 2021 @ 2:02pm

Well-Done

Cook a Grenade for too long.
Unlocked 6 Jan, 2021 @ 11:30am



Centripetal Attraction

Kill 20 Enemies with the Hivehand.

Futile Resistance

Kill 10 Enemies with Snarks.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.

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.

Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts 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.

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.

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.

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.​

Limitless Potential

Accept G-Man’s offer of employment.

Rather an Anticlimax

Decline G-Man’s offer of employment.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked