A "complete" save file typically unlocks the following content: Full Roster
Since you wrote "— paper" at the end, if you meant you need a of the save data’s hex values or a paper guide to manually recreate a save: Dragon Ball Z Shin Budokai 2 Save Data
Due to the difficulty of unlocking all content, the "Save Data" topic is a popular subject in online gaming forums (such as GameFAQs, Reddit, and emulator communities). A "complete" save file typically unlocks the following