Complete all 13 main path challenge missions under par time
Complete all lessons in the tutorial
Complete the first challenge mission, "Dead Meat"
Complete all 13 main path challenge missions
Complete all 50 challenge missions
Complete all 50 challenge missions under par time
Complete any 10 challenge missions
Complete any 25 challenge missions
Kill all giant bears in "Number One Threat to America"
Kill 20 Enemy Commandoes
Kill 20 Desolator Troopers
Kill 20 Steel Ronin
