Successfully complete the indicated task to unlock the corresponding achievement.

Achievement	How to unlock
Completionist	You have collected all stars and beaten the bonus world.
Grayscales	You have collected all stars in World 7.
Green with Envy	You have collected all stars in World 2.
How did you do that?	You completed a level under par.
Mellow Yellow	You have collected all stars in World 3.
Orange you glad	You have collected all stars in World 4.
Purpletastic	You have collected all stars in World 6.
Redemption	You have collected all stars in World 5.
Star Collector	You have collected 100 stars.
Star Hunter	You have collected 200 stars.
Star Master	You have collected 400 stars.
Star Power	You have collected 50 stars.
Too Blue	You have collected all stars in World 1.
Ultra Star	You have collected all stars.