Below is a list of unlockables available while playing Tales of the Abyss.

Unlockable	How to unlock
Game Record	Complete the game to have access to this from the title screen.
Grade Shop	Complete the game and save the file. Then, when you start a new game on a new file, you will have access to the grade shop from your complete file.
Sound Test	Complete the game to be able to access this via the main screen.
Unknown Mode	Complete the game once.
Very Hard Mode	Complete the game once.
Abyss Replica Facility Dungeon	Save Shiba, and complete the Ortion Cavern of the EAST side quest, then go to Sheridan, talk to two men in the Northwest of Sheridan. go back to find Shiba again, now you can access to Abyss Replica Facility Dungeon.