Complete the following tasks to unlock Vita trophy rewards.

Trophy	How to unlock
Favorite tower (Bronze)	All improvements purchased on a single tower.
Invulnerable (Gold)	All episode levels completed with 3 stars.
Last chance (Silver)	Level completed with last remaining life.
Long John Silver (Bronze)	Only one enemy ship attacked the outpost gates during the level.
Magic storm (Silver)	200 spells cast.
One thousand demons (Bronze)	1000 ships sunk.
Sea dog (Bronze)	Level completed in fast mode.
Strike me down! (Bronze)	Level failed 3 times in a row.
Top marks (Silver)	Level completed without using more than 5 towers.
Warlock (Silver)	One spell improved to maximum level.