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17 of 50 (34%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 8 May, 2021 @ 7:11am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 9 May, 2021 @ 1:50am

Convection Refinement

Ruin the microwave casserole.
Unlocked 8 May, 2021 @ 7:09am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 22 May, 2021 @ 11:40am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 21 Nov @ 1:46pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 17 Nov @ 1:06pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 23 Nov @ 3:26am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 8 May, 2021 @ 7:04am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 12 May, 2021 @ 11:45am

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 23 Nov @ 3:26am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 20 Nov @ 1:05pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 8 May, 2021 @ 7:24am

Following the Rules

Use the welcome mat.
Unlocked 21 Nov @ 12:04pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 23 Nov @ 2:22am

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 23 Nov @ 2:16am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 23 Nov @ 3:54am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 23 Nov @ 3:59am



Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

Centripetal Attraction

Kill 20 Enemies with the Hivehand.

Dead Reckoning

Kill an Assassin with the .357 Magnum.

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.

Inflammatory Actions

Kill a Headcrab using fire.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.

Quantum Capacitance

Overcharge it anyway.

Rare Specimen

Send the Hidden Hat to Xen.

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​​.

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.

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