I have recently replayed Skyrim through with the aim of completing all Achievements to get the elusive Platinum Trophy - not usually a big one for achievements but I enjoyed Skyrim so much and had so many from simply progressing through the storyline I thought I would give it a try. This is my second play through, and my newest character is at Level 40 with 180+ hours under the belt.

The Oblivion Walker achievement is the second last one I have to check off, and the Master achievement. I have completed all the Daedric Artifacts quests, only to not have the achievement unlock!! I have the items:-

The Black Star
Dawnbreaker
Ebony Blade
Ebony Mail
Mace of Molag Bal
Masque of Clavicus Vile
Mehrune's Razor
Oghma Infinium
Sanguine's Rose
Skull of Corruption
Spellbreaker
Savior's Hide
Ring of Namira
Wabbajack
Volendrung

This is infinitely frustrating, as this was the most difficult achievement on my second play through I had to unlock!! Also, I am loathe to start a new file and attempt this achievement again without knowing if the same issue will occur again!!!

Does anyone have any suggestions that could help? Other than these two final achievements I have completed all others, including all DLC achievements, and this has really left a sour taste in my mouth after completing nearly 300 hours of a fantastic game!!!

If you do the theives guild questline you can get one more deadric artifact that counts toward the achievement

I have completed all questlines except the Companions as I was a Vampire Lord (including Thieve's Guild); even though from my understanding you aren't required to physically own all the Artifacts at once, completing the quests is enough... I do have all those 15 items in my inventory at any one time

what item was the LAST one out of the 15 you got? ... if it was the masque of clavicus by killing barbas, youll need to revert to an earlier save and perform a little "trick" so the item actually gets addressed.. if it was anything else, try actually reading the Oghma Infinium and using it

The last item I got was Spellbreaker, and I used the OI probably 50 hours ago but since the Patch it doesn't disappear as it once did

it doesnt? and you can use it again? or will it simply open the book and do nothing?

I can open the book and nothing happens. I had hoped that maybe using each of the items would unlock the achievement but alas, no cigar...

hmm... load a save in which you havent yet used the oghma. make sure you do not have atleast one other artifact acquired as well. then make a new save in a new save slot (and make sure your character is not in any dlc-related areas!!!). exit the game, go into the game data folder in the XMB and delete a file named Skyrim Update. load up the save file you had made, read the book. then save once more (and as usual, best not to overwrite any saves) reinstall the dlc's and the latest patch. then go get the last artifact you need to get, and the achievement should register.

if this fails, there might be something already corrupted in your game data (which in order have probbably altered the save files as well) and then you should re-install from scratch, and try to get this achievement on a whole new character

Thanks for the suggestion