Complete the following tasks to unlock Vita trophy rewards.

Trophy	How to unlock
Action Fan (Bronze)	Clear challenge 'Action Fan'.
Can't hide from me (Silver)	Shoot down a rare enemy.
Chain Expert (Bronze)	Clear challenge 'Chain Expert'.
Challenge Master (Gold)	Unlock and successfully pass 12 or more base challenges.
Collector (Bronze)	Clear challenge 'Collector'.
Hellfire (Bronze)	Clear challenge 'Hellfire'.
Key Explorer (Silver)	Collect all 35 secret keys in stage one through seven.
Key Master (Silver)	Collect all 15 secret keys in stage eight through ten.
Kill Collector (Bronze)	Clear challenge 'Kill Collector 1'.
King of unlockables (Silver)	Unlock at least seven specials.
Lucky Number 7 (Bronze)	Collect an accumulated total of 77777 chain rings.
No time to waste (Bronze)	Defeat the final boss in stage eight in under 115 seconds.
Not that difficult after all (Bronze)	Complete the seventh stage ('Van Krist Labs') at any difficulty level.
Piece of rock (Bronze)	Complete the third stage ('Ethia Ruins') at any difficulty level.
Profiler (Bronze)	Clear challenge 'Profiler'.
Rank Master (Bronze)	Clear challenge 'Rank Master'.
Rating Expert (Bronze)	Clear challenge 'Rating Expert'.
Ready for the junkyard (Bronze)	Complete the first stage ('Zeus Sector') at any difficulty level.
Score Collector (Bronze)	Clear challenge 'Score Collector 1'.
Speed Collector (Bronze)	Clear challenge 'Speed Collector'.
Speed Gunner (Bronze)	Clear challenge 'Speed Gunner'.
Stage Keys (Bronze)	Clear challenge 'Stage Keys'.
Survivor (Bronze)	Clear challenge 'Survivor'.
System liberated (Bronze)	Complete the fifth stage ('Turady Deep Sea') at any difficulty level.
The Last Chapter (Bronze)	Complete the tenth stage ('Inner Core') at any difficulty level.