Here is the full list of all 14 Caveman World: Mountains of Unga Boonga achievements.
Gather 500 Collectibles
Gather 250 Collectibles
Gather 100 Collectibles
25 Stars Earned
50 Stars Earned
75 Stars Earned
Break 10 Eggs
Break 25 Eggs
Break 50 Eggs
Use Star Trader to add +1 Life
Use Star Trader to add +1 Energy
Gather 1,000 Collectibles
Gather 1,500 Collectibles
Complete All Levels