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42 of 50 (84%) achievements earned:
Personal Achievements
 

Brownian Motion

Pass the toilet paper to the Scientist in need.
Unlocked 6 May, 2015 @ 4:15pm

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Unlocked 7 May, 2015 @ 6:01pm

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Unlocked 13 May, 2015 @ 12:31am

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Unlocked 27 May, 2015 @ 11:23pm

Convection Refinement

Ruin the microwave casserole.
Unlocked 6 May, 2015 @ 4:14pm

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Unlocked 21 May, 2015 @ 7:17pm

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Unlocked 28 May, 2015 @ 3:35pm

Ethically Questionable

Conduct all of the questionable research experiments.
Unlocked 31 May, 2015 @ 7:41pm

Futile Resistance

Kill 10 Enemies with Snarks.
Unlocked 29 May, 2015 @ 6:30pm

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Unlocked 11 May, 2015 @ 2:32pm

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Unlocked 28 May, 2015 @ 8:58am

Inflammatory Actions

Kill a Headcrab using fire.
Unlocked 7 May, 2015 @ 5:51pm

Kinetic Repulsion

Kill a Marine with their own Grenade.
Unlocked 29 May, 2015 @ 10:35am

Mega Hertz

Kill 5 Enemies with one Grenade.
Unlocked 28 May, 2015 @ 3:08pm

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Unlocked 22 May, 2015 @ 4:03pm

Permeable Infrastructure

Use the alternate path in Office Complex.
Unlocked 8 May, 2015 @ 2:12pm

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Unlocked 28 May, 2015 @ 8:52am

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Unlocked 28 May, 2015 @ 9:28am

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Unlocked 6 May, 2015 @ 4:06pm

Quantum Capacitance

Overcharge it anyway.
Unlocked 28 May, 2015 @ 8:32am

Rare Specimen

Send the Hidden Hat to Xen.
Unlocked 18 Jun, 2015 @ 6:06pm

Remote Detonation

Kill a Barnacle with a Satchel.
Unlocked 29 May, 2015 @ 11:01am

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Unlocked 6 May, 2015 @ 4:32pm

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Unlocked 28 May, 2015 @ 3:52pm

Universal Gravitation

Get killed by your own Snarks.
Unlocked 28 May, 2015 @ 8:33am

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Unlocked 6 Mar, 2020 @ 7:06pm

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Unlocked 8 Mar, 2020 @ 6:28pm

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Unlocked 6 Mar, 2020 @ 5:07pm

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Unlocked 6 Mar, 2020 @ 1:12pm

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Unlocked 9 Mar, 2020 @ 1:19pm

Following the Rules

Use the welcome mat.
Unlocked 9 Mar, 2020 @ 1:54pm

Gonad Glider

Get whacked into oblivion in the ledge fight.
Unlocked 11 Mar, 2020 @ 7:13pm

The Plan

Use Cyanogen to kill Gonarch.
Unlocked 16 Mar, 2020 @ 2:19am

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Unlocked 16 Mar, 2020 @ 2:20am

Contest Propellant

Find the snack supply canister.
Unlocked 11 Mar, 2020 @ 12:19pm

Laser Immunization

Complete Interloper without taking any laser damage.
Unlocked 13 Mar, 2020 @ 10:23pm

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Unlocked 11 Mar, 2020 @ 7:02pm

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Unlocked 13 Mar, 2020 @ 10:58pm

Limitless Potential

Accept G-Man’s offer of employment.
Unlocked 13 Mar, 2020 @ 11:04pm

Rather an Anticlimax

Decline G-Man’s offer of employment.
Unlocked 13 Mar, 2020 @ 11:03pm

Pepperoni Precipitation

View the *other* secret ending.
Unlocked 13 Mar, 2020 @ 11:01pm

Well-Done

Cook a Grenade for too long.
Unlocked 6 Mar, 2020 @ 6:58pm



Prolific Popper

Kill all Protozoans in the Borderworld.

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.

Post-Mortem Interval

Find each member of the missing research teams.

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.

Late for Work

Defeat Nihilanth in under 4 minutes.​
+2

2 hidden achievements remaining

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