Here is the full list of all 30 River City Girls trophies - there are 16 bronze, 6 silver, 7 gold and 1 platinum.
That wasn't very nice!
Was defeated in detention.
Completed the game with a secret character.
Complete the game in Co-Op.
Completed the game on Hard.
K.O. the secret boss.
Destroyed all Sabu statues.
Collected $5000
K.O. Sabuko.
Enter the Penthouse.
Completed all of Godai's quests.
K.O. Noize.
Defeated an enemy with a fish.
K.O. Abobo.
Find the keys in the junk yard.
K.O. Hibari.
Parry 10 enemy attacks.
Obtain an item from the Pawn Shop.
Catch a boomerang.
K.O. Yamada.
Enter the Mall.
Equip a new outfit.
Defeated an enemy by hitting them with another enemy.
K.O. Misuzu.
Destroy a vending machine.
Attacked Mr. Rudis.
Obtain all trophies in "River City Girls".
Catch a dodgeball thrown by your ally.
Reached Max Level.
Reach 100% completion.