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36 of 50 (72%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 14 Nov @ 2:05pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 15 Nov @ 1:15am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 15 Nov @ 2:22am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 16 Nov @ 2:56pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 14 Nov @ 2:04pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 18 Nov @ 5:00pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 25 Nov @ 4:55pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 22 Nov @ 6:10am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 15 Nov @ 4:36am

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 18 Nov @ 5:11pm

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 23 Nov @ 2:46pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 16 Nov @ 8:37am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 22 Nov @ 6:06am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 16 Nov @ 11:18am

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 25 Nov @ 4:10pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 22 Nov @ 5:59am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 22 Nov @ 6:17am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 14 Nov @ 2:03pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 16 Nov @ 11:14am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 21 Nov @ 2:28pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 16 Nov @ 11:39am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 16 Nov @ 3:20pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 16 Nov @ 2:56pm

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Unlocked 25 Nov @ 1:05pm

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Unlocked 25 Nov @ 1:44pm

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 22 Nov @ 6:08am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 25 Nov @ 4:47pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 16 Nov @ 3:16pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 25 Nov @ 4:23pm

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Unlocked 23 Nov @ 4:33pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 25 Nov @ 4:29pm

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Unlocked 25 Nov @ 4:36pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 23 Nov @ 4:33pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 24 Nov @ 7:02am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 24 Nov @ 7:02am

Well-Done

Cook a Grenade for too long.
Unlocked 14 Nov @ 2:36pm



Ethically Questionable

Conduct all of the questionable research experiments.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Prolific Popper

Kill all Protozoans in the Borderworld.

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.

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.​
+6

6 hidden achievements remaining

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