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