Here is the full list of all 31 Zombie Kill of the Week - there are Reborn achievements.
And still going?
Encounter all 3 tanks, and get them killed.
Get promoted to rank 30.
Get the GiGaGirlGannon, and kill 10 zombies within 10 seconds.
You have wasted 5 hours of your life.
Help your friend in need.
Slaughter 10 000 zombies in total.
Find the fridge and make it disappear. Repeat 3 times.
Open all areas in a single match.
Own atleast 5000$ in one match
Kill 15 zombies with a katana, and 25 with saw in one match.
Slice 53 zombies in one match.
Slaughter 5000 zombies in total.
Get yourself killed with a grenade. Dumbass.
Stand still for 30 seconds, wondering about your life.
Fight your way to round 20.
Get 100 headshots in one match.
You have played ZKW for an hour.
Kill the zombie bear before he takes your money.
Grill 50 zombies with flame in a single match.
Get promoted to rank 10.
Zombies are not ment to fly.
Get 5 meats in a single game from the fridge.
Go see your friends!
Get a shotgun, and make 20 zombies crawl in front of you.
Survive 4 minutes in Abandoned Hospital. (Challenge mode)
Survive 4 minutes in RedSnow. (Challenge mode)
Survive 4 minutes in Night At The Mall. (Challenge mode)
Survive 4 minutes in Arise. (Challenge mode)
Survive 4 minutes in Area 73. (Challenge mode)
Survive 4 minutes in Homerun. (Challenge mode)