Black Mesa achievements

27.30%

Mega Hertz

Kill 5 enemies with one grenade.

28.19%

Quantum Capacitance

Overcharge it anyway.

29.65%

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.

32.16%

Centripetal Attraction

Kill 20 enemies with the Hivehand.

32.60%

Dead Reckoning

Kill an Assassin with the .357 Magnum.

32.97%

Permeable Infrastructure

Use the alternate path in Office Complex.

35.07%

Caffeine Extraction

Perform surgical caffeine extraction from 20 machines.

35.52%

Inflammatory Actions

Kill a Headcrab using fire.

37.79%

Premature Expulsion

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

46.98%

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.

53.14%

Gray Matter Propulsion

Headshot 20 enemies with the .357 magnum.

68.41%

Convection Refinement

Ruin the microwave casserole.