Shouldn't that be stated then? I have completed the dungeon solo though as the triumph states. Actually, the triumph states that I have simple completed each encounter solo. That further indicates that it shouldn't need to be done in one shot.
Though I do appreciate the feedback and may attempt to redo when I have quite a bit of time to try.
Yes, it should be stated (since it’s stated on other triumphs). However, it’s not been added to this one (among others I think). So for now it is what it is.