The following video clips and illustrations become unlocked in Museum mode when the indicated task has been completed.

Unlock Nightmare Extra:
Defeat Nightmare in Stage 5 of Story mode.

Unlock Siegfried Extra:
Defeat Siegfried in Stage 5 of Story mode.

Unlock Algol Extra:
Defeat Algol in Stage 5 of Story mode.

Unlock Alternate Opening:
Defeat ‘The Apprentice’ in Yoda’s Arcade.

Unlock Chain of Souls Icons:
Defeat and unlock any character in the Story mode.

Unlock Character Endings:
Complete Story Mode with any character.

Unlock Art Gallery Illustrations:
Purchase for 1,000-2,000 Gold.