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25 of 50 (50%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 30 Nov, 2015 @ 7:50pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 2 Dec, 2015 @ 3:33pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 3 Dec, 2015 @ 11:29pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 3 Jan, 2016 @ 11:47am

Convection Refinement

Ruin the microwave casserole.
Unlocked 30 Nov, 2015 @ 7:47pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 4 Dec, 2015 @ 12:26pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 7 Dec, 2015 @ 3:43pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 7 Dec, 2015 @ 2:31pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 7 Dec, 2015 @ 2:19pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 2 Dec, 2015 @ 4:34pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 8 Dec, 2015 @ 11:07am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 30 Nov, 2015 @ 8:30pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 7 Dec, 2015 @ 2:59pm

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 7 Dec, 2015 @ 4:07pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 7 Dec, 2015 @ 4:37pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 2 Dec, 2015 @ 3:35pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 8 Dec, 2015 @ 11:03am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 2 Dec, 2015 @ 4:37pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 30 Nov, 2015 @ 7:46pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 7 Dec, 2015 @ 2:39pm

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 7 Jan, 2016 @ 9:46am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 2 Dec, 2015 @ 5:10pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 30 Nov, 2015 @ 8:10pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 7 Dec, 2015 @ 10:49pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 7 Dec, 2015 @ 2:34pm



Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

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.

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.

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.

Well-Done

Cook a Grenade for too long.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked