I had cleared all the way to the final encounter with no deaths solo. When I went and took the cannon up to proceed to the last room, I had to pause and was away long for enough the booted to orbit for inactivity action happened. I though no problem just load back in with the check point, started this solo so I can finish solo with no deaths between the two sessions. A while later of playing it Real Safe to kill the boss in about 5 damage phases and all I get is the weekly progression flair and nothing else, none of the three triumphs that pertain to going solo flawless for the first time proccing them.
Greetings!
Unfortunately, the run will not count because it was loaded from a checkpoint (when you got booted to orbit for inactivity). In order for the triumph to be completed, you will have to run a complete run from the very beginning.