Completion bonuses:
Successfully complete the game to unlock a movie viewer option and a mini-game
featuring Tachikoma.

Weapon bonuses:
Play through a level with only a handgun. At the end of the level you will be given
the dual wieldable version of that handgun. You will be able to equip both of the
handguns in one weapon slot.

Successfully complete all single player mode levels with a character to unlock his
or her custom weapon. After unlocking it, the weapon can be used by any
character.

Collect a weapon that is not in your inventory during game play, and have it
equipped when completing the level. When the next level begins, it will be a part of
your available inventory.