Eliminate 10 Scientists and stop them from spreading their filthy lies.

Master the mastery of controlling your controls.

Complete the Single Player game.

Complete the Multiplayer game.

(26)  

Create 5,000 filets.

Collect all 47 cakes in Single Player mode.

Collect all 47 cakes in Multiplayer mode.

(11) 

Select "Credits" from the "Help & Options" menu and watch the whole thing.

How long can you handle being a pacifist?

Let your hyper little brother play the game for a bit.

Complete the Single Player game in Hardcore mode.

Be on the lookout for an old friend.