Black Mesa achievements

11.07%

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.

11.95%

Ethically Questionable

Conduct all of the questionable research experiments.

12.36%

Kinetic Repulsion

Kill a Marine with their own grenade.

12.64%

Futile Resistance

Kill 10 enemies with Snarks.

14.18%

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.

16.48%

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.

18.58%

Resonance Procrastinator

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

18.94%

Remote Detonation

Kill a Barnacle with a Satchel.

19.02%

Nuclear Fishin'

Kill an Icthyosaur with either the Tau or Gluon.

19.87%

Universal Gravitation

Get killed by your own Snarks.

22.29%

Well-Done

Cook a Grenade for too long.

25.04%

Calculated Trajectory

Kill 10 Airborne Headcrabs using the Shotgun.