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

A True Hero (Episode 1, 2, 3) (Silver): Safely rescue all normal survivors. 
Art Collector (Bronze): Collect each and every special survivor to fill your 
gallery. 
Cave Cleaner (Bronze): Kill over 100 enemies. 
Cave Cleaner Pro (Bronze): Kill over 500 enemies. 
Cave Cleaner Supreme (Bronze): Kill over 1000 enemies. 
Coin Collector (Bronze): Pick up 100 coins in one spin. 
Don't Touch Me (Bronze): Clear a stage without touching any walls. 
Liquid Love (Bronze): Kill over 100 enemies using fluids rather than weapons. 
No Stone Unturned (Bronze): Discover all secret areas in the game. 
Sharp Shooter (Bronze): Build a combo of 16 or over. 
Treasure Hunter 1 (Bronze): Get all the treasure from Episode 1. 
Treasure Hunter 2 (Silver): Get all the treasure from Episode 2. 
Treasure Hunter 3 (Gold): Get all the treasure from Episode 3.