SHReK the THiRD

While you are playing a mission, when you press start you will see a checklist of objectives to accomplish in each level. These also include completing the level without dieing and finding all mugs on each level.( Finding the Drawings on the levels are not necessary for this achievement). Complete 2/3 of these objectives for the achievement.

Here is a great guide for the Mugs:

http://www.xbox360achievements.org/forum/showthread.php?t=36...

Thanks to Marx0r for the guide!