here is save for level 28, copy it to 'C:\ProgramData\Playrix Entertainment\4 Elements' remember to backup your previous save, then load the game. this is the level with lots of rocks that fall down at halfway/near end 3 rows, use 5+ combos to blow them up, blow 20 up, achievement unlock.

https://www.dropbox.com/s/8ll9t4wnhfv8oxb/GameInfo.xml