Trophies - Successfully complete one of the following tasks to get a trophy:

Stray Cat (Bronze): Earn a support character.
All Together Now (Bronze): Do a Team-Up attack involving all three party members.
Nine Lives (Bronze): Kill an enemy using the feline support character Thomas Kemper.
Pack Rat (Bronze): Find and collect all of the hidden collectibles scattered around the game.
Pacifist (Bronze): Win one battle using only counterattacks.
Fight 'Em With Items (Bronze): Use every combat item at least once in the game.
Level Awesome (Bronze): Get all party members to Level 15.
A Winner Is You (Silver): Successfully complete the first episode.
Steel Devils (Silver): Find and destroy all the robots in the game.
Silent, But Deadly (Silver): Beat the final Boss without healing.
Clean Sweep (Silver): Kill all enemies in Episode 1.
Immortal (Gold): Play and win the game without allowing a character to die during combat.

Bonus comic - Collect all the artwork to unlock a secret comic at the inventory screen.