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Brownian Motion

Pass the toilet paper to the Scientist in need.
Ξεκλειδώθηκε στις 12 Ιουν 2015, 13:34

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Ξεκλειδώθηκε στις 11 Δεκ 2019, 17:42

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Ξεκλειδώθηκε στις 12 Δεκ 2019, 18:33

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Ξεκλειδώθηκε στις 14 Ιουν 2015, 12:05

Convection Refinement

Ruin the microwave casserole.
Ξεκλειδώθηκε στις 12 Ιουν 2015, 13:32

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Ξεκλειδώθηκε στις 13 Δεκ 2019, 13:18

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Ξεκλειδώθηκε στις 14 Δεκ 2019, 18:49

Ethically Questionable

Conduct all of the questionable research experiments.
Ξεκλειδώθηκε στις 13 Δεκ 2019, 17:17

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Ξεκλειδώθηκε στις 11 Δεκ 2019, 18:14

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Ξεκλειδώθηκε στις 14 Δεκ 2019, 19:21

Inflammatory Actions

Kill a Headcrab using fire.
Ξεκλειδώθηκε στις 11 Δεκ 2019, 15:23

Mega Hertz

Kill 5 Enemies with one Grenade.
Ξεκλειδώθηκε στις 19 Φεβ 2017, 12:37

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Ξεκλειδώθηκε στις 14 Ιουν 2015, 5:40

Permeable Infrastructure

Use the alternate path in Office Complex.
Ξεκλειδώθηκε στις 12 Ιουν 2015, 17:01

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Ξεκλειδώθηκε στις 14 Δεκ 2019, 19:13

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Ξεκλειδώθηκε στις 11 Δεκ 2019, 15:16

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Ξεκλειδώθηκε στις 11 Δεκ 2019, 14:52

Quantum Capacitance

Overcharge it anyway.
Ξεκλειδώθηκε στις 13 Δεκ 2019, 17:09

Rare Specimen

Send the Hidden Hat to Xen.
Ξεκλειδώθηκε στις 26 Ιουν 2021, 17:35

Remote Detonation

Kill a Barnacle with a Satchel.
Ξεκλειδώθηκε στις 12 Δεκ 2019, 18:16

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Ξεκλειδώθηκε στις 11 Δεκ 2019, 15:09

Universal Gravitation

Get killed by your own Snarks.
Ξεκλειδώθηκε στις 26 Ιουν 2021, 12:45

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Ξεκλειδώθηκε στις 30 Ιουν 2021, 19:17

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Ξεκλειδώθηκε στις 26 Ιουν 2021, 15:05

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Ξεκλειδώθηκε στις 21 Ιουν 2021, 17:58

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Ξεκλειδώθηκε στις 29 Ιουν 2021, 18:48

Limitless Potential

Accept G-Man’s offer of employment.
Ξεκλειδώθηκε στις 30 Ιουν 2021, 19:19

Well-Done

Cook a Grenade for too long.
Ξεκλειδώθηκε στις 21 Ιουν 2021, 18:22



Futile Resistance

Kill 10 Enemies with Snarks.

Kinetic Repulsion

Kill a Marine with their own Grenade.

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.

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.​

Rather an Anticlimax

Decline G-Man’s offer of employment.
+6

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