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29 of 50 (58%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 18 Sep, 2021 @ 1:29am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 18 Sep, 2021 @ 1:50am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 21 Sep, 2021 @ 11:12pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 21 Sep, 2021 @ 11:15pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 18 Sep, 2021 @ 1:27am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 19 Sep, 2021 @ 2:37am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 19 Sep, 2021 @ 3:38am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 21 Sep, 2021 @ 1:54pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 21 Sep, 2021 @ 11:18pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 19 Sep, 2021 @ 1:54am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 21 Sep, 2021 @ 11:14pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 27 Sep, 2021 @ 11:48pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 21 Sep, 2021 @ 10:57pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 19 Sep, 2021 @ 1:53am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 27 Sep, 2021 @ 10:49pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 19 Sep, 2021 @ 3:52am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 27 Sep, 2021 @ 11:57pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 27 Sep, 2021 @ 11:02pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 19 Sep, 2021 @ 3:18am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 25 Sep, 2021 @ 3:23am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 19 Sep, 2021 @ 9:49pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 27 Sep, 2021 @ 11:46pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 27 Sep, 2021 @ 10:59pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 27 Sep, 2021 @ 11:56pm

Following the Rules

Use the welcome mat.
Unlocked 28 Sep, 2021 @ 12:03am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 23 Sep, 2021 @ 1:02am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 25 Sep, 2021 @ 3:55am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 25 Sep, 2021 @ 3:54am

Well-Done

Cook a Grenade for too long.
Unlocked 19 Sep, 2021 @ 4:31am



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.

Mega Hertz

Kill 5 Enemies with one Grenade.

Rare Specimen

Send the Hidden Hat to Xen.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

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.​
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked