Here, list your current Achievement level. This will be listed as your 'Initial' Halo 4 Achievement Level. It'll help us analyze what you need to get to the illusive 100% Completion. As a dear (and now dead) friend of mine said, "Help me help you!" -Crewman 626, moments before being vaporized by a plasma grenade. Oh, sweet memories.
To view your achievement level, simply sign in to xbox.com and view your activities. It can also be seen when signed in to Xbox Live.