Achievements
Complete each achievement to get the allotted gamerscore
Unlock Hidden 3D StageViewer
Anytime during the singleplayer game press the right bumper and back buttons at the same time to pause the game and enter a hidden 3D stageviewer Left thumbstick tilts and rotates the view right thumbstick zooms in and out and pans left and right and the triggers raise and lower the field of vision
