Unlockable: Fourth Weapons
You have to Smith the weapon to level 4. In a battle get 500 K.O.s.


Unlockable: Time Limit
Finish Empire Mode.


Unlockable: Officer Death Options
You must unlock 50 weapons.


Unlockable: Adjust Time Limit
You must finish Empire Mode.


Unlockable: All Image Galleries & Scenes
You must collect all 4th weapons & 1000 KOs medals for all unique characters.


Hint - Fourth Weapons
Use the smith to upgrade your characters weapon to level 4. Then, successfully complete any battle with 500 or more kills. At the end of the battle, you will receive that characters fourth weapon.