I got 14 deadric artifact but i have used the oghma infinium ca i stille get the achievement ?? please help me ...

you should already have it it count every artifact you recieve even if you use it just make sure you have all of them so gather them up and count them out

There are 17 Daedric Princes, 16 of them give artifacts in this game and there are 15 Daedric Quests and one item you get from another faction. I think you need all 16 to get the Achievement

http://elderscrolls.wikia.com/wiki/Daedric_Artifacts_%28Skyrim%29

http://elderscrolls.wikia.com/wiki/Daedric_Quests_%28Skyrim%29