Here is the full list of all 21 The Brookhaven Experiment trophies - there are 21 bronze.
Decapitate each enemy type at least once.
Acquire 200 throwables in campaign mode.
Blow the head off of something large and toothy.
Finish a nighttime campaign level without turning on the flashlight.
Survive a nighttime campaign level using only the knife.
Survive the final campaign level.
Survive the ninth campaign level.
Acquire all guns and upgrades in campaign mode.
Survive the eight campaign level.
Survive the seventh campaign level.
Survive the sixth campaign level.
Survive the fifth campaign level.
Kill 1000 enemies.
Survive the fourth campaign level.
Survive the third campaign level.
Survive the second campaign level.
Kill four enemies at once with an explosive.
Acquire all guns and upgrades in a survival game.
Survive ten waves in a survival map.
Kill 100 enemies.
Survive the first campaign level.