Here is the full list of all 987 Zombie Boom achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Destroy 1 more enemy
Get 40 Gold Medals
Get 35 Gold Medals
Get 30 Gold Medals
Get 25 Gold Medals
Get 20 Gold Medals
Get 15 Gold Medal
Get 5 Gold Medal
Get 1 Gold Medal
Get 45 Gold Medal
Get 50 Gold Medals
Get 55 Gold Medal
Get 60 Gold Medal