Here is the full list of all 21 PixelJunk Monsters Ultimate HD trophies - there are 21 bronze.
Complete 10 levels on Tum Tum island
Unlock all the extra content
Perfect clear the specified stage
Destroy 15 enemies at once with the Mortar Tower
Clear the specified stage without using gems
Clear the specified stage with a balance of 10,000 worth of coins or more
Clear the specified stage by building every type of tower
Clear the spcified stage without using the fire tower
Clear the specified stage using only arrows and cannons
Complete the specified stage without crossing the bridge
Drop 100 coins into the water and clear the specified stage
Without selling any towers, clear the specified stage with all towers upgraded to black
Clear the specified stage using only bombs to destroy the boss
Clear an entire wave of enemies using only a bomb
Clear every stage!
Perfect Clear every stage
Perfect clear 5 stages in two player mode
Clear the specified stage with 25 or more gems
Clear the specified stage without a tower ever upgrading
Clear a stage without losing a single coin