Achieved
Achievement
% of players
Unlock date
YesBrownian Motion

Pass the toilet paper to the Scientist in need.

84.96%19/04/2017, 19:23:51
YesConvection Refinement

Ruin the microwave casserole.

72.82%19/04/2017, 19:15:33
NoGray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.

59.68% 
YesProphylactic Suggested

Get overtaken by a Headcrab's ample anterior.

50.41%19/04/2017, 20:35:30
YesCaffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.

38.73%19/04/2017, 20:14:46
NoPermeable Infrastructure

Use the alternate path in Office Complex.

30.97% 
NoCentripetal Attraction

Kill 20 Enemies with the Hivehand.

29.87% 
YesProverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

26.33%19/04/2017, 19:25:59
YesInflammatory Actions

Kill a Headcrab using fire.

25.68%19/04/2017, 20:29:52
NoQuantum Capacitance

Overcharge it anyway.

21.83% 
NoDead Reckoning

Kill an Assassin with the .357 Magnum.

20.8% 
NoUniversal Gravitation

Get killed by your own Snarks.

14.54% 
YesResonance Procrastinator

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

13.98%19/04/2017, 19:53:02
NoCalculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.

13.05% 
NoRemote Detonation

Kill a Barnacle with a Satchel.

12.31% 
NoDigital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

11.62% 
YesMega Hertz

Kill 5 Enemies with one Grenade.

10.96%19/04/2017, 22:57:29
NoNuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.

9.97% 
NoHyper Saturation Conundrum

Drown in Lambda Core's coolant.

9.38% 
NoEthically Questionable

Conduct all of the questionable research experiments.

9.06% 
NoFutile Resistance

Kill 10 Enemies with Snarks.

8% 
NoPremature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.

7.97% 
NoUnified Coupling Theorum

Help the Barnacle and Headcrab find true love.

6.22% 
NoKinetic Repulsion

Kill a Marine with their own Grenade.

5.73% 
NoRare Specimen

Send the Hidden Hat to Xen.

3.35% 
NoRather an Anticlimax

Decline G-Man’s offer of employment.

0% 
NoOur Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.

0% 
NoProlific Popper

Kill all Protozoans in the Borderworld.

0% 
NoThe Rarest Specimen

Carry the Hidden Hat to Endgame.

0% 
NoLate for Work

Defeat Nihilanth in under 4 minutes.​

0% 
NoSpecimen GG

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

0% 
NoStealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.

0% 
NoThe Plan

Use Cyanogen to kill Gonarch.

0% 
NoUnquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.

0% 
NoWell-Done

Cook a Grenade for too long.

0% 
NoFollowing the Rules

Use the welcome mat.

0% 
NoPepperoni Precipitation

View the *other* secret ending.

0% 
NoPost-Mortem Interval

Find each member of the missing research teams.

0% 
NoGonad Glider

Get whacked into oblivion in the ledge fight.

0% 
NoDoctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.

0% 
NoAnti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.

0% 
NoBlack Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.

0% 
NoLaser Immunization

Complete Interloper without taking any laser damage.

0% 
NoLess Than Desirable Consequences

Die in the AMS Beam before starting the experiment.

0% 
NoLimitless Potential

Accept G-Man’s offer of employment.

0% 
NoOne Step Ahead

Kill 10 Enemies with Tripmines​​.

0% 
NoOrbital Trajectory

Skip the opening Xen island with a secret jump.​

0% 
NoContest Propellant

Find the snack supply canister.

0% 
NoPhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.

0% 
Noxen when

Wait too long to jump into the Lambda Teleporter.

0% 

    

Achievements last synchronized on 02/11/2017, 10:23.