Free arena:
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Complete the game once to unlock it. 

Free missions:
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Complete the game once to unlock it. 

Bonus emblems:
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Earn an "A" rank in all missions in the indicated episode to unlock the emblem.

Crescent Moon: Episode 4
Danger       : Episode 9
Dark Rider   : Episode 12
Fefnir       : Episode 8
Fenrir       : Episode 5
Milicona     : Episode 13
Necron       : Episode 14
Nineball     : Episode 2
Pink Cat     : Episode 3
Rave         : Episode 11
Unknown      : Episode 6
Shadow       : Episode 10
Silver Wolf  : Episode 7
Sledge Hammer: Episode 15

First person view:
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Reach a 100% completion rating in the Revolution Disk. 
Then, press Start to pause game play, then hold Select and press Start to resume.

Left Hand Karasawa:
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Finish the game succesfully.