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



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



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



Can't hide from me
Shoot down a rare enemy




Key Explorer
Collect all 35 secret keys



Challenge Master
Unlock and successfully pass 12 or more challenges