I too have just came back to this and starting to boost. Boosted all but the lone wolf stuff no problems. What will get you banned is an idle controller or guest. My friend got a week ban for xp because they were boost xp with muptile guest and quitting matches. They have an automatic system that detects this. Other wise your goldern.The problem is finding enough people that are within 10 ranks of you so you get paired up.
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Please click link if you are a member of x360a or TA and hate people boosting achievements please!! http://www.amishrakefight.org/gfy/