I have finished the main storyline and killed miraak in the dragonborn dlc, but when looking at the achievements i noticed i didnt have all parts of dragon aspect and when looking on the internet where to get the third part of dragon aspect it says its right before climbing on miraaks dragon after killing the two seekers so i need to know why i cant get back and get it because im too far ahead now and cant reload a save from before then and reading the waking dreams book puts you on the last chapter i have searched and searched on the internet coming up with nothing but reload a save please help (if help is even possible in this situation)

I was under the impression learning the Word there is what triggers that dragon to appear in the first place, so I'm not sure how you could've missed it. Because I got too close to that Word Wall while fighting the seekers and had the dragon show up before I could kill those seekers. Are you sure you got the one in Raven Rock mine?