Haven’t done this in a while But i’m looking for people to get achievements with. i have a lot of achievements to get so the more you need the better. trying to get main, and DLC, so send me a message via XBL GT: Chris D Abyzs
I would like to help you. I would do anything to achieve the commando-armor. 
Here is a link for ya once you get started on your achievement huntings and are questioning why they aren’t unlocking… Enjoy!
https://forums.halowaypoint.com/yaf_postst236154_Halo-4-Achievement-Issues.aspx
i’ll look out for those
Basic summary (save you a little reading time as the thread is 58 pages): Any achievement that is cumulative over multiple maps may be glitched.
Any achievement that must be done on a single map (the majority) works just fine. You can still obtain the vast majority of the achievements.
343 is hard at work investigating a fix & is keeping us informed via the thread posted above.
I will help I need the shocking achievement and that is my last one for the game…help would be overwhelming with joy.