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
Hold 25.000 Clefines in your inventory
Collect all shop books
Retrieve the Baton
Buy all skills from all classes
Reach level 50 with any class
Hold 10.000 Clefines in your inventory
Retrieve the Drum
Retrieve the Violin
Hold 5.000 Clefines in your inventory
Complete all sidequests
Reach level 30 with any class
Retrieve the Bell
Retrieve the Sousaphone
Retrieve the Accordion
Freeze an enemy
Complete 50% of all sidequests
Retrieve the Harp
Use a skill 100 times or more
Retrieve the Lyre
Reach level 10 with any class
Poison an enemy
Burn an enemy
Retrieve the Bagpipes
Complete the prologue
Complete a sidequest
Revive a party member
Play with 2-4 players