The Dungeon report you linked is a checkpoint run. The dungeon has to be done in one run without going to orbit , getting disconnected or generally leaving for any reason. Checkpoint runs do not count for the solo achievement.
Additionally dungeon report just scrapes data , it is not authorative for achievements. Beyond that Duality has a load of bugs that can mess up runs at the best of times.
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Thanks for the answer. It's a checkpoint run because I went to grab food after Ghalran and was returned to orbit when I got back. I know that for solo flawless you have to do it in one session, but when I first did Shattered Throne solo a couple years ago I didn't finish it in one session and got the solo triumph, so I don't see why that wouldn't be the case for Duality.
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Bungie changed the rules a while back , all dungeons need to be done in one sitting now.
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Ah that sucks, thanks allot for clarifying though.
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