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27 of 50 (54%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 11 Feb, 2020 @ 9:06am

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 25 Mar, 2020 @ 8:02am

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 25 Mar, 2020 @ 9:06am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 15 Jul, 2020 @ 11:16am

Convection Refinement

Ruin the microwave casserole.
Unlocked 27 Dec, 2019 @ 1:42pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 15 Jul, 2020 @ 8:58am

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 29 Nov, 2020 @ 10:26am

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 30 Nov, 2020 @ 12:08pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 30 Dec, 2019 @ 2:56pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 1 Dec, 2020 @ 11:53am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 3 Jan, 2020 @ 8:27am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 6 Jan, 2020 @ 1:25pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 28 Dec, 2019 @ 5:36am

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 31 Jan, 2020 @ 2:50pm

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 28 Dec, 2019 @ 5:31am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 13 Mar, 2021 @ 10:02am

Quantum Capacitance

Overcharge it anyway.
Unlocked 30 Dec, 2019 @ 3:43pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 1 Dec, 2020 @ 11:44am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 25 Sep, 2021 @ 2:22pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 29 Nov, 2020 @ 10:03am

Universal Gravitation

Get killed by your own Snarks.
Unlocked 14 Jul, 2020 @ 2:34pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 11 Nov, 2021 @ 10:50am

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 25 Sep, 2021 @ 2:16pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 2 Dec, 2020 @ 1:19pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 23 Jul, 2020 @ 8:13am

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 23 Jul, 2020 @ 8:14am

Well-Done

Cook a Grenade for too long.
Unlocked 11 Jul, 2020 @ 5:52pm



Ethically Questionable

Conduct all of the questionable research experiments.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

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.

Orbital Trajectory

Skip the opening Xen island with a secret jump.​

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.

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.​
+7

7 hidden achievements remaining

Details for each achievement will be revealed once unlocked