Killed at least 1,000 zombies with a shotgun.
Killed at least 1,000 zombies with a revolver.
Performed a rampage attack.
Killed at least 1,000 zombies with a pistol.
Used melee attack 100 times in one session.
Killed 500,000 zombies.
Racked up to 30 level.
Exploded at least 100 cars in one session.
Killed the first Undead Boss.
Didn't shoot for whole six minutes and survived.
Scored 10,000,000 experience points in a single session.
Stayed alive at least 60 minutes.
Killed at least 1,000 zombies with an Uzi.
Killed at least 1,000 zombies with an M-16.
Killed at least 1,000 zombies with an M-60.
Killed at least 1,000 zombies with a crossbow.
Killed at least 1,000 zombies with a Plasma gun.
Killed at least 1,000 zombies with a flare gun.
Killed at least 1,000 zombies with a Pepyaka gun.
Killed at least 1,000 zombies with a Spread gun.
Killed at least 1,000 zombies with a Volcano machine gun.
