Complete the following tasks to unlock PlayStation 3 trophy rewards.

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