Naruto: Ultimate Ninja PS2

Unlockables
Capsule Machines

By achieving the appropriate rank, the following machines will be unlocked.
Unlockable How to Unlock
Capsule Machine for Collectors Achieve the rank of "Chunnin"
Capsule Machine for Maniacs Achieve the rank of "Anbu"

Contributed By: QuartrGuy
Characters

These characters are unlocked in order. You'll need to finish the character's story mode in order to use him / her in any other mode.
Unlockable How to Unlock
Cursed Marked Sasuke Get Chunnin rank
Gaara Finish Zabuza's story mode.
Haku Finish Hinata's story mode.
Hinata Hyuuga Finish Neji's story mode.
Kyuubi Naruto Complete all B Rank missions
Neji Hyuuga Finish story mode with any of the 6 original characters.
Orochimaru Finish Garaa's story mode.
Zabuza Momochi Finish Haku's story mode.

Contributed By: Spenze, Tenguman123, Windmaster715
Hidden Scrolls

These are the locations of the hidden scrolls for the first S rank mission. You can obtain these in any mode, and practice mode would be the obvious choice. You can exit the stage and save once you've obtained the scroll.
Unlockable How to Unlock
44 Forest of Death (foreground) Attack the fish on the left 3 times.
Bridge (foreground) Wait 3 seconds on the game clock while standing on the boat.
Chunnin Testing Stage (foreground) Run through the tunnel from the left entrance and exit the right. Repeat 3 times.
Hero's Gravestone (any) Attack your opponent's support character 5 times.
Hokage's Statue Stage (foreground) Jump repeatedly on the tree to the left.
Nightly Rooftop Map (background) Stand on the tail of the right fish statue until the scroll appears.
Ramen Shop (foreground) Hit the lanterns so each of them grows red.
Survival Stage (background) Destroy the doll on the right 10 - 15 times.
Tornado Sand Map (background) Destroy 8 objects flying within the tornado.
Wind Clan (foreground) Keep attacking the vending machine until the scroll shows up.
Yagura map with the Giant Frog & Snake (background) Jump from the top of the frog to the snake, then jump back.
Zabuza's Home (background) Wait 3 seconds on the game clock while standing on the balcony.

Contributed By: Spenze
More S Rank MIssions!

These missions are unlocked after completing a certain mission.
Unlockable How to Unlock
Mission #11 Finish Icha Icha Paradise (99 times each pair) Complete S Rank Mission #2 Icha Icha Paradise
Mission #12 Collect 9,999,999 worth of money Finish all non-S rank missions (Hokage Rank)

Contributed By: EvolutionKing
Ranks

These are ranks you get from the missons you play
Unlockable How to Unlock
Anbu get 2,170 EXP
Chunin get 500 EXP
Genin get 50 EXP
Hokage get 2,490 EXP
Jonin get 1,750 EXP
Special Jonin get 1,150 EXP

Contributed By: DarthTyris
Unlockable Stages

Beat Gaara's story mode to unlock the village of sand stages.
Unlockable How to Unlock
2 Village of Sand stages Beat Gaara's story mode
Great Naruto Bridge Comeplete Haku's Story
Kazekage's Mansion Comeplete Gaara's Story
Sumanigo Estate and Buddha Statue Comeplete Gaara's Story
Zabuza's Hideout Comeplete Haku's Story