Successfully complete ten assignments with an "S" rank in Assignment mode.
Ayame's unbreakable sword
Collect all scroll parts as Ayame.
Classic Tenchu costumes
Complete Story mode.
Colored rice
Complete all fifty training assignments with an "S" rank.
Extra assignments
There are a total of four extra assignments that can be unlocked for each mission in Story mode. Your rank in a mission will determine how many of its extra assignments will become unlocked.
Two extra assignments: Get a "B" rank in a Story mode mission.
Three extra assignments: Get an "A" rank in a Story mode mission.
Four extra assignments: Get an "S" rank in a Story mode mission.
Music gallery
Successfully complete twenty assignments with an "S" rank in Assignment mode.
Ninja Tabi '08
Successfully complete Story mode.
Oni mask
Get all mask parts as Rikimaru and Ayame. Wear it to use Onikage. If equipped with a sword he will wield an unbreakable large sword that does a big amount of damage.
Rikimaru's unbreakable sword
Collect all scroll parts as Rikimaru.
Shadow mode
Successfully complete a mission in Normal Story mode. You can now press Start at the mission selection screen in Story mode to switch to Shadow mode. This will allow you to replay the completed missions with more enemies, less items, and alternate layouts.
Sound gallery
Successfully complete twenty assignments with an "S" rank in Assignment mode.