This will unlock Infinite Ammo for All Weapon BUT the Magnum and the Rocket Launcher will not have infinite Ammo for the New Game.

Remember, it's Infinite Ammo but not Infinite for the current Clip.

This is also unlock all the Select game.

Unlock All Mission on Select Game for Allen and Celia Finish the Game with anyone
Unlock All Weapon for Allen Finish the Game with Allen
Unlock All Weapon for Celia Finish the Game with Celia
Unlock Infinite Ammo for Allen Finish the Game with Allen
Unlock Infinite Ammo for Celia Finish the Game with Celia