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I think there will be achievements for beating the game, all metals, so many sticks, and beating campaign.
I hope, yet again, more replay value.
This question can already be answered by using the huge mushy thing in your head
obviously for beating it on legendary
who knows, the achievements might turn out to be just like perfect dark zero's. but hopefully tuned a little better [instead of going in intervals of 10, 100, 1000]
I hope they make a BFG skull for beeting the game on Easy.