How to get a badge:
1. Go to survival mode
2. Buy Pancor Jackhammer (3rd Auto Shotgun)
3. Buy Speed Loader (PowerUp)
4. Stay near the building and don't let zombies hit it, spray only lately in the game, when it's needed.
If you have problems with medium badge - upgrade your skills in using certain kind of weapon (for example Far East Weapons), find or buy the best weapon for your class (for Eastern its Black Spirits) and get from enemy blue armor/helmet wich increase damage.
 "FPS-MAN"){kind=icon}
 "The Endless Zombie Rampage"){kind=icon}
 "Feudalism"){kind=icon}
 "Death Penalty"){kind=icon}
 "New Star Soccer"){kind=icon}