Finish wave 8 with at least one active ward
Finish wave 16 with at least one active ward
Take out 100 ghouls by vacuuming them up
Take out 500 ghouls by vacuuming them into oblivion.
Wow you must be obsessed, you have to take out 1,000 ghouls to achieve this.
Complete boss wave 24
Reach wave 10 without a ward being hit by a minion ghoul
Reach wave 10 without loosing a heart