Defeat the object in the first level
Defeat the first boss
Collect 3 same items
Collect 3 different items
Get a life item
Defeat the object in the second level
Defeat the second boss
Get 500 stars
Defeat the object in the third level
Defeat the third boss
See the mother ship
Go through the obstacles of the fourth stage
Defeat the fourth boss
See a dead monster
See the star in the sky
Finish the game at any level
Finish the game in hard level