Here is the full list of all 29 AereA trophies - there are 15 bronze, 6 silver, 7 gold and 1 platinum.
You are the true Grand Meastro
Upgrade all skills from all classes to level 3
Buy all skills from all classes
Collect all shop books
Retrieve the Baton
Hold 25.000 Clefines in your inventory
Reach level 50 with any class
Retrieve the Drum
Retrieve the Violin
Retrieve the Bell
Hold 10.000 Clefines in your inventory
Complete all sidequests
Reach level 30 with any class
Retrieve the Sousaphone
Retrieve the Accordion
Retrieve the Harp
Hold 5.000 Clefines in your inventory
Complete 50% of all sidequests
Freeze an enemy
Retrieve the Lyre
Use a skill 100 times or more
Poison an enemy
Reach level 10 with any class
Burn an enemy
Retrieve the Bagpipes
Revive a party member
Play with 2-4 players
Complete the prologue
Complete a sidequest