Tenchu: Shadow Assassins

Get all of the map pieces in Stages 6 through 9 under the Normal difficulty. Alternately, collect all scroll parts as Ayame.
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Complete all fifty training assignments with an "S" rank.

Acquiring S rank per mission in story mode unlocks 4 additional assignments. This unlocks all possible extra assignments per one mission in story mode. Obtaining A rank will grant 3 of the extra 4 assignments. Finally achieving B rank will give 2 of the 4 extra assignments.

Successfully complete Story mode.

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.

Collect all scroll parts as Rikimaru.

After successfully completing a mission, you can switch to "Shadow Mode" by pressing the Start button at the Story Mode - Mission Select screen. This allows you to play a more difficult version of the missions you have already completed with less items and more enemies in different configurations.

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.

Earn an "S" rank on all 50 Assignments.

Finish all 50 trainings with an S Rank. This will add the Colored Rice to your inventory.