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