The following bonuses are unlocked if the indicated task is done before the game is successfull completed.

Character illustrations: Have the Hand mirror of Utsmi from level BF18.
Sound mode: Have the old music box from level BF28.
Item picture book: Have the item book from level BF39.
Yggdra game records: Have the Lithography of Mesara from level BF44.
Card illustrations: Have the Revelations of Pantheon from level BF47.