Here is the full list of all 9 Soft Body trophies - there are 6 bronze, 1 silver and 2 gold.
Complete 15 Hard Game levels
Complete Soft Game
Defeat the Triangle Prince
Defeat Islund and Eyn, the two snakes
Complete all 25 Hard Game levels
Complete all 25 Hard Game+ Levels
Find the opera
Start from Chapter 1-1 and complete every Soft Game level without your Soft Body taking damage
Complete Rooster 100