|Completed all 4 Levels in 'Normal' difficulty mode|
You need to complete every section of all four levels of the Story mode on the Normal difficulty level. This can done in either Singleplayer or Co-op, but do not try to mix your playthrough up with both as this can cause your game to lose progress. Normal difficulty itself isn't very hard, the first 2 levels are quite easy, the last 2 get a little more challenging. Having a decent rank in each of your skill categories helps tremendously.
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