Insane mode:
To unlock Insane mode, beat the game.
Secret comic:
To unlock a secret comic at the inventory screen, collect all artwork.
Trophies:
Bronze trophies
All Together Now – Do a team-up attack involving all three party members.
Fight ‘Em With Items – Use every combat item at least once in the game.
Level Awesome – Get all party members to Level 15.
Nine Lives – Kill an enemy using the feline support character thomas kemper.
Pacifist – Win one battle using only counterattacks.
Pack Rat – Find and collect all of the hidden collectibles scattered around the game.
Stray Cat – Earn a support character.
Silver trophies
A Winner Is You – Complete the first episode.
Clean Sweep – Kill all enemies in episode 1.
Silent, But Deadly – Beat the final boss without healing.
Steel Devils – Find and destroy all the robots in the game.
Gold trophies
Immortal – Play and win the game without allowing a character to die during combat.