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Brownian Motion

Pass the toilet paper to the Scientist in need.
Upplåst 27 dec, 2015 @ 16:49

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Upplåst 16 dec, 2019 @ 17:31

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Upplåst 25 jan, 2016 @ 12:40

Convection Refinement

Ruin the microwave casserole.
Upplåst 27 dec, 2015 @ 16:48

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Upplåst 1 dec, 2018 @ 4:11

Ethically Questionable

Conduct all of the questionable research experiments.
Upplåst 14 dec, 2019 @ 16:20

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Upplåst 25 jan, 2016 @ 13:00

Inflammatory Actions

Kill a Headcrab using fire.
Upplåst 22 dec, 2019 @ 15:32

Mega Hertz

Kill 5 Enemies with one Grenade.
Upplåst 22 aug, 2020 @ 12:19

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Upplåst 11 mar, 2020 @ 8:17

Permeable Infrastructure

Use the alternate path in Office Complex.
Upplåst 30 dec, 2015 @ 5:21

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Upplåst 6 dec, 2019 @ 16:40

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Upplåst 12 dec, 2018 @ 14:14

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Upplåst 2 aug, 2018 @ 4:20

Quantum Capacitance

Overcharge it anyway.
Upplåst 12 dec, 2019 @ 11:25

Remote Detonation

Kill a Barnacle with a Satchel.
Upplåst 7 mar, 2020 @ 18:35

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Upplåst 6 mar, 2020 @ 6:18

Universal Gravitation

Get killed by your own Snarks.
Upplåst 12 dec, 2019 @ 11:22

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Upplåst 31 aug, 2020 @ 7:39

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Upplåst 12 mar, 2020 @ 6:43

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Upplåst 14 aug, 2020 @ 13:12

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Upplåst 10 aug, 2020 @ 9:27

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Upplåst 31 aug, 2020 @ 16:09

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Upplåst 28 feb, 2022 @ 8:41

Contest Propellant

Find the snack supply canister.
Upplåst 30 aug, 2020 @ 18:23

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Upplåst 19 mar, 2020 @ 15:13

Late for Work

Defeat Nihilanth in under 4 minutes.​
Upplåst 31 aug, 2020 @ 15:44

Limitless Potential

Accept G-Man’s offer of employment.
Upplåst 20 mar, 2020 @ 7:43

Rather an Anticlimax

Decline G-Man’s offer of employment.
Upplåst 31 aug, 2020 @ 15:35

Well-Done

Cook a Grenade for too long.
Upplåst 2 mar, 2020 @ 9:29



Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

Futile Resistance

Kill 10 Enemies with Snarks.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Rare Specimen

Send the Hidden Hat to Xen.

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

Prolific Popper

Kill all Protozoans in the Borderworld.

One Step Ahead

Kill 10 Enemies with Tripmines​​.

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.

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
+6

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