Here is the full list of all 21 Crazy Mob achievements.
Pass the 1st level
Throw 6000 watermelons
Blow 100 bubbles
Build 300 snowmen
Blow up 50 gift boxes
Throw 100 anvils
Kill 400 mushrooms
Kill 400 turtles
Kill 100 yetis
Kill 150 mummies
Kill 100 zebras
Kill 80 skeletons
Kill 50 zombies
Kill 30 pumpkins
Kill 20 dragons
Kill 5 demons
Pass all the Forest levels
Pass all the Desert levels
Pass all the Swamp levels
Pass all 3 game-worlds
Pass 3 game worlds with Gold