Yeah. So... What gives? I solo'd Duality, took me two days to do it, got the 'All fireteam Solar' and 'All fireteam same class' Triumphs, but when I beat the last boss, I did NOT get the 'Complete the dungeon solo' triumph... Does this SERIOUSLY have to be done in one sitting?
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Yes, you need to complete the Dungeon in one session. If you leave for any reason, or someone joins you, it will invalidate your run.