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29 of 50 (58%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 28 Nov @ 12:20pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 2 Dec @ 12:08pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 3 Dec @ 12:22pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 9 Dec @ 1:30pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 28 Nov @ 12:18pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 5 Dec @ 12:10pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 2 Dec @ 12:57pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 9 Dec @ 10:48am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 9 Dec @ 11:11am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 5 Dec @ 10:42am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 2 Dec @ 10:48am

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 2 Dec @ 1:03pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 2 Dec @ 1:09pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 9 Dec @ 11:16am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 2 Dec @ 12:05pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 10 Dec @ 12:35pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 2 Dec @ 10:34am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 28 Nov @ 12:07pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 9 Dec @ 11:05am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 3 Dec @ 12:51pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 28 Nov @ 12:42pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 10 Dec @ 11:19am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 5 Dec @ 12:09pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 10 Dec @ 11:29am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 12 Dec @ 12:58pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 2 Dec @ 12:49pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 28 Nov @ 12:40pm

Following the Rules

Use the welcome mat.
Unlocked 12 Dec @ 1:24pm

Well-Done

Cook a Grenade for too long.
Unlocked 2 Dec @ 11:28am



Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Rare Specimen

Send the Hidden Hat to Xen.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

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