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21 of 50 (42%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 15 Nov @ 7:09am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 16 Nov @ 3:40am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 16 Nov @ 10:07am

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 16 Nov @ 3:50am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 17 Nov @ 1:01pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 16 Nov @ 2:51am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 17 Nov @ 11:12am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 15 Nov @ 7:34am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 17 Nov @ 1:16pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 17 Nov @ 11:10am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 16 Nov @ 2:53am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 17 Nov @ 1:13pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 7 Dec @ 6:13am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 16 Nov @ 10:16am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 16 Nov @ 10:49am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 16 Nov @ 10:37am

xen when

Wait too long to jump into the Lambda Teleporter.
Unlocked 17 Nov @ 12:15pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 7 Dec @ 6:29am

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 8 Dec @ 5:54am

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 8 Dec @ 6:03am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 8 Dec @ 6:01am



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Convection Refinement

Ruin the microwave casserole.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Ethically Questionable

Conduct all of the questionable research experiments.

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.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

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.

Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

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.

Late for Work

Defeat Nihilanth in under 4 minutes.​

Well-Done

Cook a Grenade for too long.
+6

6 hidden achievements remaining

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