Fighting the mobs in inFamous is always something that you'll be doing, so wouldn't it be nice to have some extra help in fighting them? Here are the buffs that you can get with unlockables that will help you with fighting foes:
Casey Jones: Kill 25 enemies while you're on the train. Yes, the train has to be moving for this one.
Clean Up Your Act: Defeat Sasha in any mode.
Fish in a Barrel: Whack over 50 mobs by using only water.
Further Down the Rabbit Hole: Gather up all of the Dead Drops that are available in the Warren district of the game.
Get Off My Cloud: Get over 100 take downs with your High Fall.
Just Scratched the Surface: Gather up all of the Dead Drops that are available in the Neon District of the game.
Oh, You've Done This Before: Kill over 50 enemies with a grenade. (You can do this by sticking them with one or by blowing up several at a time.)
Red Baron: Take down or kill over 100 enemies while they are in the air as well.
Road Kill: Kill 25 enemies while you are on top of the roof of a moving car, truck, or other vehicle.
Taking Out the Trash: Defeat Alden in any mode of the game.
The Hunger: Manage to Bio Leech over 100 enemies.
You're So Sly: Gather up all of the Dead Drops that are available in the Historic District.