Complete the following tasks to unlock PlayStation 3 trophy rewards.

Trophy	How to unlock
Gravichallengium (Bronze)	Discover all 5 of the Challenges in the Heavy Elements content pack.
Gravisium (Gold)	Complete all the Discovery Mode levels in the Heavy Elements content pack.
Heavybonusium (Bronze)	Discover all 10 of the Bonus Levels in the Heavy Elements content pack.