Here is the full list of all 11 Zombie Party achievements.
Play Zombie Party for Twelve hours! Go Home!!!
Play Zombie Party for six hours! Keep going!!!
Die 15 times!
Eat 69 Cheeseburgers!
Um... yeah.
Gotta blow 'em up!
Shoot 10,000 Bullets!
Have 10,000 gold in your player account!
Have 25,000 gold in your player account!
Play Zombie Party for one hour!
Hop around until something happens!