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27 of 50 (54%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 3 Oct, 2017 @ 10:03pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 4 Oct, 2017 @ 9:37pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 6 Oct, 2017 @ 11:45pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 8 Oct, 2017 @ 2:19pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 3 Oct, 2017 @ 10:02pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 7 Oct, 2017 @ 12:02am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 5 Oct, 2017 @ 8:18pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 7 Oct, 2017 @ 12:27pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 5 Oct, 2017 @ 8:38pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 8 Oct, 2017 @ 1:44pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 4 Oct, 2017 @ 8:37pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 7 Oct, 2017 @ 12:36pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 11 Mar, 2020 @ 1:25pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 7 Oct, 2017 @ 9:19pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 4 Oct, 2017 @ 9:27pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 7 Dec, 2019 @ 11:43am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 5 Oct, 2017 @ 8:49pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 3 Oct, 2017 @ 10:00pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 7 Oct, 2017 @ 9:16pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 8 Oct, 2017 @ 3:16pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 6 Oct, 2017 @ 5:36pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 4 Oct, 2017 @ 5:08pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 4 Nov @ 1:02am

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 27 Oct @ 12:12am

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 10 Nov @ 10:23pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 4 Nov @ 12:04am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 5 Nov @ 7:39pm



Futile Resistance

Kill 10 Enemies with Snarks.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Universal Gravitation

Get killed by your own Snarks.

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.

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

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.

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.​

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