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Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Upplåst 21 nov, 2020 @ 15:30

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Upplåst 26 nov, 2020 @ 14:09

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Upplåst 26 nov, 2020 @ 15:01

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Upplåst 26 nov, 2020 @ 13:50

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Upplåst 21 nov, 2020 @ 15:16

Permeable Infrastructure

Use the alternate path in Office Complex.
Upplåst 31 okt, 2020 @ 15:10

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Upplåst 26 nov, 2020 @ 15:16

Quantum Capacitance

Overcharge it anyway.
Upplåst 25 nov, 2020 @ 14:34

Universal Gravitation

Get killed by your own Snarks.
Upplåst 26 nov, 2020 @ 15:18

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Upplåst 29 nov, 2020 @ 11:20

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Upplåst 28 nov, 2020 @ 12:27

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Upplåst 28 nov, 2020 @ 12:46



Brownian Motion

Pass the toilet paper to the Scientist in need.

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

Convection Refinement

Ruin the microwave casserole.

Ethically Questionable

Conduct all of the questionable research experiments.

Futile Resistance

Kill 10 Enemies with Snarks.

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

Inflammatory Actions

Kill a Headcrab using fire.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Mega Hertz

Kill 5 Enemies with one Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

Rare Specimen

Send the Hidden Hat to Xen.

Remote Detonation

Kill a Barnacle with a Satchel.

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.

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​​.

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.​

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​.

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

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