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30 of 50 (60%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 7 May, 2015 @ 12:54am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 7 May, 2015 @ 1:40am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 7 May, 2015 @ 2:45am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 8 May, 2015 @ 2:40am

Convection Refinement

Ruin the microwave casserole.
Unlocked 7 May, 2015 @ 1:27am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 7 May, 2015 @ 4:22am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 8 May, 2015 @ 2:52am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 8 May, 2015 @ 1:40am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 8 May, 2015 @ 1:42am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 7 May, 2015 @ 2:18am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 8 May, 2015 @ 5:40am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 7 May, 2015 @ 1:40am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 8 May, 2015 @ 5:47am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 7 May, 2015 @ 2:05am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 8 May, 2015 @ 2:00am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 7 May, 2015 @ 2:03am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 8 May, 2015 @ 5:37am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 7 May, 2015 @ 1:22am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 7 May, 2015 @ 12:53am

Quantum Capacitance

Overcharge it anyway.
Unlocked 8 May, 2015 @ 1:36am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 22 May, 2017 @ 11:42pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 7 May, 2015 @ 3:26am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 7 May, 2015 @ 1:45am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 7 May, 2015 @ 3:32am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 8 May, 2015 @ 1:38am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 1 Dec, 2020 @ 6:17am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 1 Dec, 2020 @ 9:29pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 1 Dec, 2020 @ 9:20pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 2 Dec, 2020 @ 1:32am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 8 Feb @ 1:08am



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.

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.​

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked