The Brookhaven Experiment achievements

Survive ten waves in a survival map.

Finish a nighttime campaign level without turning on the flashlight.

Acquire all guns and upgrades in campaign mode.

Survive the ninth campaign level.

Survive the seventh campaign level.

Survive the fifth campaign level.

Survive the eight campaign level.

Survive the sixth campaign level.

Survive the fourth campaign level.

Survive the third campaign level.

Kill four enemies at once with an explosive.

Kill 1000 enemies.