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