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