Here is the full list of all 11 Zombie Apocalypse trophies - there are 6 bronze, 4 silver and 1 gold.
Succesfully Won Level 1
Succesfully Won Level 2
Succesfully Won Level 3
Succesfully Won Level 4
Succesfully Won Level 5
Succesfully Won Level 6
Succesfully Won Level 7
Succesfully Won Level 8
Succesfully Won Level 9
Succesfully Won Level 10
Succesfully Won Level 12