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

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 26 Jun, 2021 @ 3:00am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 27 Jun, 2021 @ 7:51am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 26 Jun, 2021 @ 11:26am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 27 Jun, 2021 @ 7:11am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 27 Jun, 2021 @ 6:32am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 27 Jun, 2021 @ 2:07am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 27 Jun, 2021 @ 8:03am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 27 Jun, 2021 @ 8:24am

Following the Rules

Use the welcome mat.
Unlocked 27 Jun, 2021 @ 4:49am

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 27 Jun, 2021 @ 6:29am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 27 Jun, 2021 @ 7:11am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 27 Jun, 2021 @ 8:52am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 27 Jun, 2021 @ 8:51am



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

Convection Refinement

Ruin the microwave casserole.

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.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Permeable Infrastructure

Use the alternate path in Office Complex.

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.

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.

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.

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.

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.

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.
+6

6 hidden achievements remaining

Details for each achievement will be revealed once unlocked