Unlock the following characters by performing the corresponding tasks:

CHARACTER - HOW TO UNLOCK
Rin - Complete level 1 as Rikimaru.
Nasu - Complete level 1 as Ayame.
Tenrai - Complete level 10 (defeat Tatsumaru) as Ayame.
Tesshu - Complete level 20 (defeat Juzo) as Rin.
Kagura - Complete level 25 (defeat Shigi) as Tesshu.
Onikage - Complete level 30 as Rikimaru.

ACHIEVEMENT - HOW TO UNLOCK
Neophyte (10 points) - Finish Mission 1 without being spotted by anyone except Echigoya.
Apprentice (10 points) - Finish Mission 28 without being discovered by anyone.
Footsoldier (10 points) - Finish Mission 8 with at least 90 seconds left.
Genin (10 points) - Finish Mission 21 with at least 60 seconds left.
Spy (15 points) - Finish Mission 11 without taking any damage.
Chunin (15 points) - Finish Mission 26 without taking any damage.
Oniwaban (15 points) - Pull off a 15-hit combo (Solo Play).
Jonin (15 points) - Pull off a 20-hit combo (Solo Play).
Veteran Ninja (20 points) - Pull off a 25-hit combo (Solo Play).
Expert Ninja (20 points) - Unlock Kagura.
Master Ninja (25 points) - Unlock Onikage.
Legendary Ninja (35 points) - Unlock all available characters.