Galaxy Superstar
Collect all other trophies

Ready for the junkyard
Complete the first stage ('Zeus Sector') at any difficulty level

Piece of rock
Complete the third stage ('Ethia Ruins') at any difficulty level

System liberated
Complete the fifth stage ('Turady Deep Sea') at any difficulty level

Not that difficult after all
Complete the seventh stage ('Van Krist Labs') at any difficulty level

Survivor
Clear challenge 'Survivor'

Collector
Clear challenge 'Collector'

Action Fan
Clear challenge 'Action Fan'

Chain Expert
Clear challenge 'Chain Expert'

Profiler
Clear challenge 'Profiler'

Rating Expert
Clear challenge 'Rating Expert'

Lucky Number 7
Collect an accumulated total of 77777 chain rings

Key Explorer
Collect all 35 secret keys in stage one through seven

Can't hide from me
Shoot down a rare enemy

Challenge Master
Unlock and successfully pass 12 or more challenges

Speed Gunner
Clear challenge 'Speed Gunner'

Stage Keys
Clear challenge 'Stage Keys'

Speed Collector
Clear challenge 'Speed Collector'

Rank Master
Clear challenge 'Rank Master'

Kill Collector
Clear challenge 'Kill Collector 1'

Score Collector
Clear challenge 'Score Collector 1'

Hellfire
Clear challenge 'Hellfire'

The Last Chapter
Complete the tenth stage ('Inner Core') at any difficulty level

No time to waste
Defeat the final boss in stage eight in under 115 seconds

King of unlockables
Unlock at least seven specials

Key Master
Collect all 15 secret keys in stage eight through ten