Here is the full list of all 20 Slap The Rocks achievements.
Start Level 20 Through the Level Selection Menu
Start Level 19 Through the Level Selection Menu
Start Level 18 Through the Level Selection Menu
Start Level 17 Through the Level Selection Menu
Start Level 16 Through the Level Selection Menu
Start Level 15 Through the Level Selection Menu
Start Level 14 Through the Level Selection Menu
Start Level 13 Through the Level Selection Menu
Start Level 12 Through the Level Selection Menu
Start Level 11 Through the Level Selection Menu
Start Level 10 Through the Level Selection Menu
Start Level 9 Through the Level Selection Menu
Start Level 8 Through the Level Selection Menu
Start Level 7 Through the Level Selection Menu
Start Level 6 Through the Level Selection Menu
Start Level 5 Through the Level Selection Menu
Start Level 4 Through the Level Selection Menu
Start Level 3 Through the Level Selection Menu
Start Level 2 Through the Level Selection Menu
Start Level 1 Through the Level Selection Menu