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.