I had some internet connection problems so I have decided to complete some missions offline and I was not credited achievements for these missions. If I want to get these achievements, is going to the archive and completing these certain missions again enough? Or do I have to start the campaign from scratch?
For example, I was not credited an achievement for doing the baneling evolution mission and I really need it for the portrait. I clicked on the Void Seeker which is also needed for a portrait but it shows that I did not click on it.
Best Answer
You can get the achievements by replaying the missions from the archive. Don't restart the campaign because, assuming it works the same way as it did in Wings of Liberty, that will kill your ability to use the full mission archive until you complete it again.
And, of course, make sure you stay connected to Battle.net while replaying the missions.
As Raven Dreamer reminded me, anything that requires actions done in-between campaign missions would require restarting the campaign. So, to get the Void Seeker click, you'll have to replay from the beginning up to the point where that's available in the campaign.