Kill first Undead Boss.
Kill at least 1.000 zombies with each weapon type.
Perform a rampage attack.
Don't shoot for whole six minutes and survive.
Use melee attack 100 times in one session.
Stay alive at least 60 minutes.
Explode atleast 100 cars in one session.
Get 10.000.000 experience points in the single session.
Rack up to 30 level.
Kill 500.000 zombies.
