Here is the full list of all 12 Ravva and the Cyclops Curse achievements worth 1,000 gamerscore.
Clear all the Desert stages.
Find 15 hidden power-ups in total.
Clear all the Forest stages.
Collect 3 extra lives in total.
Kill 35 enemies with green power.
Kill 15 enemies with red power.
Collect 250 coins in total.
Kill 50 enemies with standard power.
Get your first Rainbow Star.
Complete the Tutorial.
Kill 35 enemies with standard power.
Kill 15 enemies with standard power.