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Brownian Motion

Pass the toilet paper to the Scientist in need.
Ξεκλειδώθηκε στις 31 Ιαν 2016, 6:54

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Ξεκλειδώθηκε στις 18 Νοε 2017, 12:34

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Ξεκλειδώθηκε στις 17 Νοε 2017, 14:46

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Ξεκλειδώθηκε στις 1 Φεβ 2016, 15:56

Convection Refinement

Ruin the microwave casserole.
Ξεκλειδώθηκε στις 31 Ιαν 2016, 6:53

Futile Resistance

Kill 10 Enemies with Snarks.
Ξεκλειδώθηκε στις 7 Ιουλ 2018, 10:39

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Ξεκλειδώθηκε στις 31 Ιαν 2016, 9:07

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Ξεκλειδώθηκε στις 14 Φεβ 2016, 12:20

Inflammatory Actions

Kill a Headcrab using fire.
Ξεκλειδώθηκε στις 31 Ιαν 2016, 7:24

Mega Hertz

Kill 5 Enemies with one Grenade.
Ξεκλειδώθηκε στις 30 Ιουν 2018, 12:06

Permeable Infrastructure

Use the alternate path in Office Complex.
Ξεκλειδώθηκε στις 31 Ιαν 2016, 8:26

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Ξεκλειδώθηκε στις 14 Φεβ 2016, 12:17

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Ξεκλειδώθηκε στις 14 Φεβ 2016, 12:33

Quantum Capacitance

Overcharge it anyway.
Ξεκλειδώθηκε στις 31 Ιαν 2016, 13:03

Remote Detonation

Kill a Barnacle with a Satchel.
Ξεκλειδώθηκε στις 31 Ιαν 2016, 12:44

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Ξεκλειδώθηκε στις 19 Νοε 2017, 6:25

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Ξεκλειδώθηκε στις 25 Απρ 2023, 15:08

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Ξεκλειδώθηκε στις 11 Φεβ 2020, 12:48

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Ξεκλειδώθηκε στις 22 Απρ 2023, 7:17

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Ξεκλειδώθηκε στις 26 Φεβ 2022, 1:48

Gonad Glider

Get whacked into oblivion in the ledge fight.
Ξεκλειδώθηκε στις 23 Απρ 2023, 14:19

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Ξεκλειδώθηκε στις 25 Απρ 2023, 13:40

Limitless Potential

Accept G-Man’s offer of employment.
Ξεκλειδώθηκε στις 30 Απρ 2023, 5:50

Rather an Anticlimax

Decline G-Man’s offer of employment.
Ξεκλειδώθηκε στις 30 Απρ 2023, 5:49

Well-Done

Cook a Grenade for too long.
Ξεκλειδώθηκε στις 26 Φεβ 2022, 5:42



Dead Reckoning

Kill an Assassin with the .357 Magnum.

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

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.

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

Rare Specimen

Send the Hidden Hat to Xen.

Resonance Procrastinator

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

Universal Gravitation

Get killed by your own Snarks.

Prolific Popper

Kill all Protozoans in the Borderworld.

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.

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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