Easy difficulty:
Lose twice on Normal.
Hard difficulty:
You must beat the game on Normal.
Critical (Issen) mode:
You must beat the game on Hard.
Oni Hard mode:
You must beat the game in Critical (Issen) mode.
Genma Puzzle game:
You must solve all puzzles in the game.
Secret Training mode game:
Finish the game and beat it on normal training mode.
Oni Shooting game:
Beat the game on Normal.
Ultimate mode:
Beat the Oni Shooting game.
Adventures of Heihachi mode:
With any difficulty beat the game.
Original Onimusha swords:
While beating the game acquire all 3 items from Phantom Realms. Then start a
new game and play with all 3 swords from the original.
Bishamon sword:
Pick it up in the Phantom Realm in Honnouji or beat the game with Onimusha rank.
Ako's Black Haori:
Beat Issen/Oni training.
Michelle's alternate costume:
Beat the game on Normal.
Michelle's second alternate costume:
Play the game with a memory card inserted containing a saved game from Onimusha
Blade Warriors or beat the game with Onimusha Rank.
Jacques' alternate costume:
With Jackques beat the game on normal or you can beat teh game with Samanusuke's
alternate costume.
Samanosuke's alternate costume:
With Samanosuke beat the game on normal and get a high score. Or you can beat
the game with Jacque's alternate costume.
Panda costume:
Play the game with a memory card inserted conataining a saved game from Onimusha
Blade Warriors or Beat Secret Training mode.
Alternate ending:
Max out all seven Haori of Ako.
