Here is the full list of all 13 Slap the Rocks (EU) trophies - there are 1 silver, 11 gold and 1 platinum.
Unlock all other trophies
Complete level 1.
Complete level 2.
Complete level 3.
Complete level 4.
Complete level 6.
Complete level 8.
Complete level 10.
Complete level 12.
Complete level 14.
Complete level 16.
Complete level 18.
Complete level 20.