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Brownian Motion

Pass the toilet paper to the Scientist in need.
解鎖於 2018 年 6 月 13 日 下午 2:43

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
解鎖於 2018 年 6 月 15 日 上午 5:11

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
解鎖於 10 月 3 日 上午 8:44

Convection Refinement

Ruin the microwave casserole.
解鎖於 2018 年 6 月 13 日 下午 2:42

Dead Reckoning

Kill an Assassin with the .357 Magnum.
解鎖於 2018 年 7 月 4 日 上午 5:19

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
解鎖於 2018 年 7 月 4 日 上午 6:54

Inflammatory Actions

Kill a Headcrab using fire.
解鎖於 2021 年 2 月 10 日 上午 6:42

Mega Hertz

Kill 5 Enemies with one Grenade.
解鎖於 2020 年 3 月 3 日 下午 4:19

Permeable Infrastructure

Use the alternate path in Office Complex.
解鎖於 10 月 18 日 上午 11:31

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
解鎖於 2020 年 3 月 5 日 上午 5:53

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
解鎖於 7 月 22 日 下午 3:26

Universal Gravitation

Get killed by your own Snarks.
解鎖於 2018 年 7 月 6 日 上午 5:19

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
解鎖於 8 月 1 日 下午 4:08

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
解鎖於 2020 年 3 月 3 日 下午 4:28

Limitless Potential

Accept G-Man’s offer of employment.
解鎖於 2020 年 3 月 3 日 下午 2:43

Rather an Anticlimax

Decline G-Man’s offer of employment.
解鎖於 2020 年 3 月 5 日 上午 8:59

Well-Done

Cook a Grenade for too long.
解鎖於 7 月 29 日 下午 4:40



Centripetal Attraction

Kill 20 Enemies with the Hivehand.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

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.

Kinetic Repulsion

Kill a Marine with their own Grenade.

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

Quantum Capacitance

Overcharge it anyway.

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.

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.

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

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