New Game+ mode:
Successfully complete the game. This mode allows two cheats to be unlocked by spending BP.
Successfully complete the game twice to view an extra scene after the credits.
Complete the indicated task to unlock the corresponding costume.
Apron Dress: Complete the game under the Easy difficulty.
Business Suit: Complete the game. Note: The costume is in the left hand locker room in the CTI Building.
China Dress: Complete the game under the Normal difficulty.
Knight Armor: Complete the game under the Deadly difficulty.
Lightning Custom: Complete the game and have at least seven stamps on the
Square-Enix Member site:
OD Suit: Complete the game and have at least one stamp on the Square-Enix
Santa Soldier: Complete the game. Note: The costume is found by going down the stairs to the lockers in Maeda's Base, and searching the one on the left.
Swim Wear: Complete the game under the Hard difficulty.
Titanium Bunny: Complete the game under the Genocide difficulty.
Successfully the game with no cheat codes enabled and with the outfit you want with a "AAA" score.
Successfully complete the game fifty times to unlock the shower scene in the "Video Log" menu. View the scene in the Video Log ten times to be able to change the camera angle to her back.
Unlocking cheats easily:
Start a New Game+ mode game. To unlock both cheats at no cost, unlock them with your BP, then reload the same New Game+ mode saved game without saving first. The game will resume with your original amount of BP while the cheats will remain unlocked.