ACHIEVEMENT - HOW TO UNLOCK Advanced Head Hunter - Collect 75 robot heads. Big Ben - Sound the bell ten times within ten seconds. Drier Spin Cycle - Perform a 540 degree flip in a vehicle. Five Second Rule - Pick up twelve toasted sandwiches. Head Hunter - Collect 20 robot heads. Heads Will Roll - Destroy five robots in two seconds. No Turning Back - Complete every level without using the time slider. Rocket Man - Propel your vehicle 150 meters into the air, using any means possible. Square Eyes - Sit in front of a TV for five minutes. The One Gnome To Rule Them All - The gnome must be cast back into the fiery chasm from whence it came. Use Your Head - Destroy a robot using a robot head.