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16 of 50 (32%) achievements earned:
Personal Achievements
 

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 18 Nov @ 11:38am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 21 Nov @ 11:09am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 25 Sep, 2022 @ 4:37am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 28 Sep, 2022 @ 1:00am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 18 Nov @ 4:24am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 28 Sep, 2022 @ 5:31am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 21 Nov @ 11:09am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 24 Sep, 2022 @ 1:00am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 28 Sep, 2022 @ 11:02am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 24 Sep, 2022 @ 1:04am

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 21 Nov @ 10:13am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 25 Sep, 2022 @ 1:21am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 18 Nov @ 4:14am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 28 Sep, 2022 @ 5:45am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 28 Sep, 2022 @ 11:25am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 28 Sep, 2022 @ 11:24am



Brownian Motion

Pass the toilet paper to the Scientist in need.

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Convection Refinement

Ruin the microwave casserole.

Dead Reckoning

Kill an Assassin with the .357 Magnum.

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.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

Quantum Capacitance

Overcharge it anyway.

Rare Specimen

Send the Hidden Hat to Xen.

Remote Detonation

Kill a Barnacle with a Satchel.

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.

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.

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.

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.​

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked