The Brookhaven Experiment achievements

2.33%
Tubthumping
Survive ten waves in a survival map.
2.33%
I Like The Night Life, Baby
Finish a nighttime campaign level without turning on the flashlight.
2.33%
To The Teeth
Acquire all guns and upgrades in campaign mode.
2.33%
Peoria Caverns
Survive the ninth campaign level.
4.65%
Bridge
Survive the seventh campaign level.
4.65%
Storm Drain
Survive the fifth campaign level.
4.65%
Sangamon Forest
Survive the eight campaign level.
4.65%
Reservoir
Survive the sixth campaign level.
13.95%
Observatory
Survive the fourth campaign level.
20.93%
Laboratory Basement
Survive the third campaign level.
20.93%
Quad Damage
Kill four enemies at once with an explosive.
34.88%
G-Note
Kill 1000 enemies.