You all need to check your achievements and not expect RN to credit you automatically when you finish an achievement.
I only receive credit for about 1/3 of the achievements that I complete. If you contact RN they make take weeks to process your request---and then you may or may not receive what you are supposed to get. All I'm saying is just double check things. It is a big problem. We dont spend 6-12 weeks in a game and then not expect to get credit for it.
One of the customer service reps that handles this is nice, the other one doesnt seem to care much about it. So you need to be proactive and watch over your own account and career. This happens to me regularly in all scenarios.