If you obtain the Skeleton Key before any other artifact, you do not unlock Note #1: Skeleton Key does NOT count for this achievement. Dawnbreaker has you retrieve a beacon, return it, then go through a dungeon.
Things that have minimal descriptions are either easy or are too simple and not worth describing, i.e. The amount of information provided on how to do the missions will vary from mission to mission, depending on if I find it necessary or not. If there are some glitches you came across and I do not have them listed, please post them in the comments and I'll add them in. Mission names are provided, level Requirement, whether they're missable or not, and glitches. The list is in alphabetical order by the name of the artifact.
You'll get a lot of awesome gear (specifically the Ebony Mail), have a few good laughs, and also get extremely frustrated (if you don't follow this guide ). There are only fifteen shrines, which means that you can't miss any, unless you employ a tactic listed under 'The Ring of Hirscine.' This is the only missable achievement in the game but it's also one of the most fun.