Item description:

(Save 1) Interceptor - Strike an enemy before entering battle around 10 times.
(Save 2) Expert Deck Builder - Keep modifying the deck until you get the trophy (Around 20 times).
(Save 4) Confronting the Darkness - Enter the final door and do the tutorial with Ansem. Go through the door and trophy will pop.
(Save 5) Challenge from the Inner Darkness - Enter the door and defeat Riku. Go through the door and trophy will pop.