i got all 15 artifact( except the skeleton key) and the achievement wont unlock. any help please

double check your achievements, maybe it didnt show up in the top right corner.

no stil says 59 out of 60

Some are missable here, I will help you

For the Calvicus Vile: Make sure you do not kill Barbas, the rueful ax is not a daedric weapon
For the rest, always kill if your lord commands it.

In addition to the above, you need to get all 15 artifacts with the same character - getting all 15 in a combination (eg 7 with one character, 8 with another) does not unlock the achievement.

yeah, but you don't have to have them all in your inventory at once, but you at least have to pick them up once. For example, at the end of the Malacath quest, the daedric artifact appears on the statue, and the quest ends, you have to pick up the hammer, even though no one really tells you to.

got all with one. mask not the axe. wonder if using the Oghma Infinium glitch messed things up