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24 of 50 (48%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 25 Jun, 2016 @ 2:47pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 28 Jun, 2016 @ 12:16pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 18 Nov, 2019 @ 12:36pm

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 3 Jul, 2016 @ 10:48am

Convection Refinement

Ruin the microwave casserole.
Unlocked 15 Nov, 2019 @ 1:49pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 18 Nov, 2019 @ 12:42pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 23 Nov, 2019 @ 4:15am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 23 Nov, 2019 @ 3:59am

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 25 Jun, 2016 @ 5:03pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 20 Nov, 2019 @ 2:17pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 23 Nov, 2019 @ 4:38am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 23 Nov, 2019 @ 4:41am

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 21 Nov, 2019 @ 2:26pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 23 Nov, 2019 @ 4:57am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 20 Nov, 2019 @ 2:15pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 25 Jun, 2016 @ 5:35pm

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 20 Nov, 2019 @ 3:21pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 20 Nov, 2019 @ 11:57am

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 21 Nov, 2019 @ 2:22pm

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 15 Nov, 2019 @ 5:47pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 21 Mar, 2021 @ 2:29pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 20 Nov, 2019 @ 11:49am

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 21 Mar, 2021 @ 1:26pm

Well-Done

Cook a Grenade for too long.
Unlocked 21 Mar, 2021 @ 12:58pm



Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Inflammatory Actions

Kill a Headcrab using fire.

Rare Specimen

Send the Hidden Hat to Xen.

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​​.

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.
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked