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

King of unlockables
Unlock at least seven specials

Hellfire
Clear challenge 'Hellfire'

Kill Collector
Clear challenge 'Kill Collector 1'

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

Rank Master
Clear challenge 'Rank Master'

Score Collector
Clear challenge 'Score Collector 1'

Speed Collector
Clear challenge 'Speed Collector'

Speed Gunner
Clear challenge 'Speed Gunner'

Stage Keys
Clear challenge 'Stage Keys'

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