Achievements
Complete each achievement to get the allotted gamerscore
UnlockableAll Stages Cleared Easy 50Clear all stages on easy difficultyAll Stages Cleared Normal 100Clear all stages on normal difficultyAll Stages Cleared Hard 150Clear all stages on hard difficultyAll Stages Cleared Hardest 200Clear all stages on hardest difficultyAll Stages Cleared Inferno 300Clear all stages on inferno difficultyAll Weapons Aquired 200Aquire all weapons