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26 of 50 (52%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 10 Mar, 2016 @ 5:29am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 10 Mar, 2016 @ 7:32am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 12 Mar, 2016 @ 2:21am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 8 Feb, 2021 @ 2:22pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 7 Feb, 2021 @ 1:15pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 11 Mar, 2016 @ 11:07am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 12 Mar, 2016 @ 4:18am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 8 Feb, 2021 @ 3:00pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 10 Mar, 2016 @ 7:31am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 7 Feb, 2021 @ 4:15pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 8 Feb, 2021 @ 2:37pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 10 Mar, 2016 @ 6:08am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 12 Mar, 2016 @ 2:02am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 10 Mar, 2016 @ 5:43am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 10 Mar, 2016 @ 6:34am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 8 Feb, 2021 @ 4:07pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 9 Feb, 2021 @ 5:08am

Following the Rules

Use the welcome mat.
Unlocked 9 Feb, 2021 @ 5:36am

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 9 Feb, 2021 @ 2:23pm

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked 9 Feb, 2021 @ 2:31pm

Contest Propellant

Find the snack supply canister.
Unlocked 10 Feb, 2021 @ 7:23am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 10 Feb, 2021 @ 7:16am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 10 Feb, 2021 @ 9:58am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 10 Feb, 2021 @ 10:06am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 10 Feb, 2021 @ 10:05am

Well-Done

Cook a Grenade for too long.
Unlocked 7 Feb, 2021 @ 5:38am



Convection Refinement

Ruin the microwave casserole.

Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

Permeable Infrastructure

Use the alternate path in Office Complex.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

Quantum Capacitance

Overcharge it anyway.

Rare Specimen

Send the Hidden Hat to Xen.

Universal Gravitation

Get killed by your own Snarks.

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.

Gonad Glider

Get whacked into oblivion in the ledge fight.

Laser Immunization

Complete Interloper without taking any laser damage.

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.

Late for Work

Defeat Nihilanth in under 4 minutes.​
+4

4 hidden achievements remaining

Details for each achievement will be revealed once unlocked