Can't unlock DLC achievements on PC

Do the achievements not unlock on the N7HQ specifically? If so, that is a known issue. I've completed them on 360 and mine still show as locked as well.

I have a similar problem.

After I installed Retaliation, Leviathan Accomplishments have disappeared, in game and in my profile on BSN.

Same problem here. I have purchased From Ashes and Leviathan but despite my best efforts, none of the achievements will unlock! A full list of achievements I have not received despite my utter certainty in having completed them:

Freedom Fighter

Prothean Expert

No Stone Unturned

Family Matters

Under Pressure

Conspiracy Theorist

I have completed all of the DLC missions at least twice.

Same problem here as well.

Same problem for me as well, although the From Ashes ones are unlocked. But instead it is the Insanity and Leviathan achievements that refuse to stay unlocked.

I have same problem. But it hapenned after instaling DLC Omega. I had achievements from Leviathan openned, but they now disappeared and  I  can't open new, even if in the game I got them, they wouldn't unlock in the Main menu - extras - achievements. I can't open achievements from the main game too, I got lvl 60 - in game "tada" achievement, but it wouldn't appear elsewhere. Achievements from DLC From Ashes are ok and opened.

And I have installed Appearance pack the same day.

Same problem after install Omega

I am a PC gamer and I did what you have suggested with loading and it worked perfectly for me. I have my achievements back. Yay. 😉

Thank you very much!