Here is the full list of all 10 #KILLALLZOMBIES achievements.
Crash atleast 100 cars in one session
Rack up to 30th level
Earn 10.000.000 experience points in a session
Do not shoot for 6 minutes
Kill first undead boss
Use melee attack 100 times in a session
Perform Rampage attack
Stay live atleast 60 minutes
Kill 500.000 zombies
Kill atleast 1.000 zombies with each weapon type