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