He prob had the guide made before the game even came out. I know I've had mine in a word doc 99% complete since last week since all the achievements are self-explanatory except for the chapter-specific ones and a couple Spartan Ops ones. I just was waiting till midnight MY time to put mine back up since it got taken down and add in all the youtube vids and the last couple descriptions, but seeing as this one is just fine there's no reason to have two on x360a. I'll stick with my walkthrough on TA. Good work OP.
HALO:MCC >>>>>>> Interested in Online Customs, Squadmates for Ranked, and Co-Op Campaign. I am on 6am-4pm GMT on my nights off (Midnight-10am US Central). Copy this signature with your play times so we can populate our friends lists with fellow Halo:MCC players BEFORE launch!! If you add me do it on XB1 please; my 360 friends list is nearly full.