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