Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Aggressive Passivity	Clear wave 5 or higher without firing your weapons.
All Guns Blazing	Equip 5 Hellgunz in one run.
Come and Get It	Defeat 66 rivals.
Comedy Gold	Destroy 6 enemies with one tossed clown.
Crazy Clown Crew	Equip 3 Clown Tossers in one run.
Driven Before You	Run over 666 enemies.
First King of Asphalt and Blood	Vanquish 66 bosses.
Great Duke of the Freeway	Vanquish 18 bosses.
Hell Bent for Leather	Earn 100% Score Bonus in one game.
Lesser President of the Right Lane	Vanquish 6 bosses.
Racing Towards the Next Hell	Complete 16 waves in one run.
Road Reaver	Defeat 666 enemies.
Runnin' on Fumes	Begin and end a boss battle with one heart remaining.
The Devil's Hand	Select the left hand upgrade 6 straight times in one run.
The Hellion	Boost for 6.66 continuous seconds.
Under the Wheels	Boost through 666 obstacles.
Unwritten Book of the Road	Take 3 shots from the same laser scorpion.