Here is the full list of all 10 FullBlast achievements.
Complete the game in all difficulty modes
Complete the game in Hard mode
Kill 1000 butterflies
Complete the game in Normal mode
Complete the game in Easy mode
Kill 500 butterflies
Kill 10 or more enemies at once
Kill 100 butterflies
Kill a level boss without using the Megabomb
Collect all Powerups in a level