Defeat the first boss
Defeat the second boss
Defeat the third boss
Defeat the fourth boss
Defeat the fifth boss
Defeat the sixth boss
Defeat the seventh boss
Defeat the eighth boss
Defeat the final boss
Hit one enemy grenade with shuriken (only on normal or hard mode)
Complete one stage without using shuriken
Defeat the ninth boss
Complete one stage on hard mode
Finish the game on easy mode
Finish the game on normal mode
Finish the game on hard mode
Defeat two or more enemies using one grenade
Finish the Boss Rush mode
Find the secret bonus in any stage