Black Mesa achievements

11.58%

Well-Done

Cook a Grenade for too long.

12.10%

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

12.41%

Kinetic Repulsion

Kill a Marine with their own grenade.

13.55%

Futile Resistance

Kill 10 enemies with Snarks.

14.68%

Ethically Questionable

Conduct all of the questionable research experiments.

15.10%

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

17.89%

Nuclear Fishin'

Kill an Icthyosaur with either the Tau or Gluon.

17.99%

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

19.34%

Remote Detonation

Kill a Barnacle with a Satchel.

20.37%

Resonance Procrastinator

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

21.20%

Universal Gravitation

Get killed by your own Snarks.

23.89%

Calculated Trajectory

Kill 10 Airborne Headcrabs using the Shotgun.