100% completion requires you to get all chests, orbs and do all the side quests. Each of those have their own guides, so I just took photos of all the maps. If you have a question about how to get to a particular area, let me know and I'll get to it on my game and add a description of how to get to it on this guide.
Great Temple photos will be up soon. Let me know if I missed anything! I recommend getting all the special moves from the goat before going after a lot of the chests. There is even one (in Pico de Gallo, see edit) that requires you to be able to fly as a chicken, which requires 6 Orbs. The last Orb is obtained when you beat Calaca.
I made an Imgur photo album because there are quite a few hi-res photos.
Here is the link (Ignore the first couple photos)http://imgur.com/a/gtJHIPlease vote positive if I've helped you and explain why you vote negative so I can fix it.
El Inferno challenges confirmed to count toward 100% - Thanks Twisted
This is the one that you need to fly to find. (Pico de Gallo)http://i.imgur.com/BoNeKD5.jpg?1