Army of Two: The 40th Day

Successfully complete the game to unlock the following costumes.

Civilian costume.
End costume.
Mall costume.
Light Armor costume.
Medium Armor costume.
Old school costume.

Upgrade a weapon until it has a very high aggro rating. It must be nearly 100% full. Note: Style upgrades such as Jigsaw and Pimp will add a lot of aggro.

You must win three consecutive games of rock paper scissors. To start a game, press Triangle while not in combat next to your partner. Use the D-pad to select rock, paper, or scissors.

Purchase and add any three homebrew upgrades to your weapon. Note: the Rusty Stock, Metal Plate, and Soda Can Silencer are recommended.

Take your time when entering a new area. There could be civilians around that you should protect, or there could be alternate paths that you and your partner can exploit.