It's a hard life
You finished the survival mode in hard difficulty.
25 
Iron Lady
You finished the story mode in hard difficulty.
25 
Sector Clear
You finished the survival mode.
20 
Guardian angel
You finished the story mode.
20 
Sold out
You bought and upgraded all guns and abilities to the max in story mode.
15 
Love Me Tender
You shook off 100 zombies in survival mode.
10 
The revenge of the meat
You killed the undead butcher.
10 
Did I break your concentration?
You killed the necromancer.
10 
See thee in Hell
You killed the evil spirit.
10 
1st Class Nun
You killed 100 zombies in story mode.
5 
Pistolera
You killed 500 zombies using only the base gun or the machine gun in survival mode.
5 
Inquisitor
You killed 500 zombies using only the flamethrower in survival mode.
5 
Ice Cold Killer
You killed 500 zombies using only the ice gun in survival mode.
5 
Fallout
You killed 500 zombies using only the explosive gun in survival mode.
5 
Wrath of God
You killed 1000 zombies using only the holy beam in survival mode.
5 
The Falcon
You killed 500 zombies using only the air slash in survival mode.
5 
One Nun Army
You bought all possible upgrades for all the weapons in survival mode.
5 
Way Of The Nunja
You upgraded all of your Nun's abilities in survival mode.
5 
Nun Corporal
You killed 500 zombies in story mode.
5 
Nun Sergeant
You killed 1000 zombies in story mode.
5