Here is the full list of all 29 Fat Princess Adventures trophies - there are 10 bronze, 12 silver, 6 gold and 1 platinum.
This is the platinum trophy and is unlocked automatically when all the trophies have been unlocked
Kill 300 Elite Enemies
Win 5 Compete Objectives in an online Grindhouse replay.
Kill 2000 Gobblings
Upgrade a warrior gear piece to Max Level
Upgrade an archer gear piece to Max Level
Upgrade a mage gear piece to Max Level
Complete the game in Hard Mode
Have 25 Gems Saved Up
Earn at least 2500 gold while playing each attitude (Hero, Clown, Evil Genius, Zen Master and Emo)
Get a character to level 20
Turn 6 enemies into chickens at the same time
Ignite 10 enemies on fire at the same time
Stun 5 enemies at the same time
Complete the game in Cakemare Mode
Kill 300 enemies in Fat Mode
Collect 100 pieces of gear
Upgrade an engineer gear piece to Max Level
Complete a replay using the Grindhouse
Complete through Chapter 7
Complete through Chapter 6
Complete through Chapter 5
Have 5000 Gold Saved Up
Kill 300 enemies in Awesome Mode
Complete through Chapter 4
Complete through Chapter 3
Complete through Chapter 2
Upgrade 5 pieces of gear
Complete through Chapter 1