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25 of 50 (50%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 13 Jan, 2017 @ 10:42pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 20 Jan, 2017 @ 1:37am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 18 Jan, 2017 @ 7:04am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 19 Jan, 2017 @ 12:28am

Convection Refinement

Ruin the microwave casserole.
Unlocked 13 Jan, 2017 @ 10:40pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 17 Jan, 2017 @ 11:09pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 20 Jan, 2017 @ 7:01am

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 21 Jan, 2017 @ 12:44am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 19 Jan, 2017 @ 4:20am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 16 Jan, 2017 @ 2:35am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 19 Jan, 2017 @ 7:41am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 20 Jan, 2017 @ 12:02am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 20 Jan, 2017 @ 7:15am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 20 Jan, 2017 @ 12:08am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 21 Jan, 2017 @ 12:58am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 20 Jan, 2017 @ 2:57am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 19 Jan, 2017 @ 7:42am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 15 Jan, 2017 @ 12:50am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 13 Jan, 2017 @ 10:33pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 18 Jan, 2017 @ 6:13am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 21 Jan, 2017 @ 4:54am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 19 Jan, 2017 @ 5:48am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 20 Jan, 2017 @ 1:53am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 20 Jan, 2017 @ 2:17am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 18 Jan, 2017 @ 6:03am



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.

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.

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked