I just managed to complete the Prophecy Dungeon solo through and through, it took me 3 days and hours of Anarchy and Catalyst grinding. All I wanted was the Cottontail Shell and now the triumph for the dungeon's "Solo Completion" isn't showing up. It's safe to say I'm more than pissed, I just need my triumph if somehow Bungie support could provide it to me. Whatever proof I have to show I will, I did screenshot the end of the dungeon out of excitement but the Forum won't let me upload files. I just want my cool ghost shell man, I cannot do that glitchy a** dungeon alone again...