Unlock all other trophies.
Finish chapter 3.
Unlock 9 pictures of the gallery.
Finish chapter 2.
Unlock 6 pictures of the gallery.
Kill 150 enemies.
Collect 150 mana or health potions.
Kill 100 enemies.
Finish chapter 1.
Collect 100 mana or health potions.
Unlock 3 pictures of the gallery.
Collect 50 mana or health potions.
Kill 25 enemies.