| Grave Busters|
Destroy all graves in Whack a Zombie.
This achievement is mostly based on luck, because of how many graves there are and how many zombies drop Sun.
Keep attempting Whack a Zombie, until there are not too many graves. Make sure that you get only Grave Busters with the Sun the zombies drop, and use up as many as possible. If you aren't able to do it, just keep restarting and you should be able to when you're lucky.