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24 of 50 (48%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 18 Nov, 2016 @ 9:31am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 18 Nov, 2016 @ 9:50am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 20 Nov, 2016 @ 6:18am

Convection Refinement

Ruin the microwave casserole.
Unlocked 18 Nov, 2016 @ 9:30am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 20 Nov, 2016 @ 2:29am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 20 Nov, 2016 @ 12:31am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 2 Jun, 2021 @ 6:58pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 5 Jun, 2021 @ 6:47am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 18 Nov, 2016 @ 11:06am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 18 Nov, 2016 @ 9:29am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 5 Jun, 2021 @ 6:32am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 18 Nov, 2016 @ 9:42am

Prolific Popper

Kill all Protozoans in the Borderworld.
Unlocked 5 Jun, 2021 @ 7:19am

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 5 Jun, 2021 @ 6:52am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 5 Jun, 2021 @ 6:32am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 2 Jun, 2021 @ 6:42pm

Post-Mortem Interval

Find each member of the missing research teams.
Unlocked 5 Jun, 2021 @ 8:06am

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 5 Jun, 2021 @ 8:12am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 5 Jun, 2021 @ 6:59am

Late for Work

Defeat Nihilanth in under 4 minutes.​
Unlocked 5 Jun, 2021 @ 7:00am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 5 Jun, 2021 @ 6:55am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 5 Jun, 2021 @ 6:54am

Pepperoni Precipitation

View the *other* secret ending.
Unlocked 5 Jun, 2021 @ 7:09am

Well-Done

Cook a Grenade for too long.
Unlocked 2 Jun, 2021 @ 7:18pm



Centripetal Attraction

Kill 20 Enemies with the Hivehand.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Permeable Infrastructure

Use the alternate path in Office Complex.

Quantum Capacitance

Overcharge it anyway.

Remote Detonation

Kill a Barnacle with a Satchel.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Universal Gravitation

Get killed by your own Snarks.

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.

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.

Laser Immunization

Complete Interloper without taking any laser damage.

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
+4

4 hidden achievements remaining

Details for each achievement will be revealed once unlocked