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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 22 Jun, 2018 @ 10:29am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 22 Jun, 2018 @ 11:45am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 22 Jun, 2018 @ 2:21pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 23 Jun, 2018 @ 8:16am

Convection Refinement

Ruin the microwave casserole.
Unlocked 22 Jun, 2018 @ 10:27am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 22 Jun, 2018 @ 7:56pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 22 Jun, 2018 @ 2:07pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 22 Jun, 2018 @ 9:29pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 23 Jun, 2018 @ 8:28am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 22 Jun, 2018 @ 12:15pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 23 Jun, 2018 @ 12:31pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 22 Jun, 2018 @ 11:50am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 22 Jun, 2018 @ 1:54pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 23 Jun, 2018 @ 4:48pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 23 Jun, 2018 @ 7:14am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 22 Jun, 2018 @ 12:06pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 23 Jun, 2018 @ 12:27pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 22 Jun, 2018 @ 11:23am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 23 Jun, 2018 @ 1:52pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 22 Jun, 2018 @ 9:21pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 23 Jun, 2018 @ 1:38pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 22 Jun, 2018 @ 6:23pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 23 Jun, 2018 @ 2:01pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 23 Jun, 2018 @ 9:18am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 22 Jun, 2018 @ 9:30pm



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