All Hail The Splode King
Complete the Single Player game in Hardcore mode.
25 
You're the Best Around!
Complete the Single Player game.
25 
A Little Help from Your Friends
Complete the Multiplayer game.
25 
Not a Portal Reference
Collect all 47 cakes in Single Player mode.
25 
Sugar High
Collect all 47 cakes in Multiplayer mode.
25 
Omaha Steaks®, Delicious!
Create 5,000 filets.
15 
Get Over Yourselves
Select "Credits" from the "Help & Options" menu and watch the whole thing.
10 
Only Gandhi Would Be Proud
Complete a level without killing any Scientists.
10 
Lay Off the Caffeine
Splode 300 times in a single level.
10 
Eventual Destruction of a Galaxy
Release The Maw from his cage and send him into space.
10 
Get Them Out of Our Schools
Eliminate 10 Scientists and stop them from spreading their filthy lies.
10 
Master of Controls
Change the controls around in the "Controls" menu.
10