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20 of 50 (40%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 15 Dec, 2018 @ 12:37pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 18 Nov @ 3:18pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 20 Nov @ 8:57pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 8 Jan, 2019 @ 12:54am

Convection Refinement

Ruin the microwave casserole.
Unlocked 15 Dec, 2018 @ 12:35pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 23 Mar, 2020 @ 10:09pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 5 Jan, 2019 @ 2:21pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 18 Nov @ 3:09pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 21 Nov @ 10:14pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 25 Mar, 2020 @ 10:02pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 5 Jan, 2019 @ 2:23pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 18 Nov @ 4:23pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 25 Mar, 2020 @ 9:50pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 24 Mar, 2020 @ 11:01am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 21 Nov @ 9:26pm

Following the Rules

Use the welcome mat.
Unlocked 21 Nov @ 9:37pm

Contest Propellant

Find the snack supply canister.
Unlocked 25 Mar, 2020 @ 8:12pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 25 Mar, 2020 @ 8:10pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 25 Mar, 2020 @ 10:23pm

Well-Done

Cook a Grenade for too long.
Unlocked 18 Nov @ 3:00pm



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.

Mega Hertz

Kill 5 Enemies with one Grenade.

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.

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.

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.

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.​

Rather an Anticlimax

Decline G-Man’s offer of employment.
+4

4 hidden achievements remaining

Details for each achievement will be revealed once unlocked