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