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23 of 50 (46%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 18 Mar, 2023 @ 2:32pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 18 Mar, 2023 @ 4:10pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 18 Mar, 2023 @ 4:03pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 18 Mar, 2023 @ 2:29pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 31 Mar, 2023 @ 2:12pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 20 Mar, 2023 @ 1:25pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 22 Mar, 2023 @ 3:28am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 18 Mar, 2023 @ 3:08pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 20 Mar, 2023 @ 11:39pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 18 Mar, 2023 @ 3:22pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 23 Nov, 2023 @ 2:46pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 18 Mar, 2023 @ 3:53pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 18 Mar, 2023 @ 3:16pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 18 Mar, 2023 @ 2:40pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 22 Mar, 2023 @ 2:46am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 18 Mar, 2023 @ 2:51pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 20 Mar, 2023 @ 11:58pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 1 Apr, 2023 @ 11:30am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 22 Mar, 2023 @ 3:27am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 23 Nov, 2023 @ 2:36pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 18 Mar, 2023 @ 2:48pm

Following the Rules

Use the welcome mat.
Unlocked 23 Nov, 2023 @ 2:47pm

Well-Done

Cook a Grenade for too long.
Unlocked 23 Nov, 2023 @ 2:39pm



Centripetal Attraction

Kill 20 Enemies with the Hivehand.

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.

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.

Quantum Capacitance

Overcharge it anyway.

Rare Specimen

Send the Hidden Hat to Xen.

Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

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.

Anti-Matter Over Mind

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

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.​

Limitless Potential

Accept G-Man’s offer of employment.

Rather an Anticlimax

Decline G-Man’s offer of employment.
+5

5 hidden achievements remaining

Details for each achievement will be revealed once unlocked