So I was doing the Eldar side missions for the Imperial Canpaign and sides with the Eldar instead of Darkhammer and got the “Immortal Alliance” achievment which is fine but then after completing the mission at Sanctuary, where you fight Darkhammer and save Os’tara I got the “End of an Immortal race” achievement which said I destroyed the Eldar craftworld, Eg sided with Darkhammer.

So just a bug for you guys, oh and the circle where Darkhammer has to get to to launch the “cyclonic torpedos” description(the text above the golden circle) is written in French.