I completed Duality for the first time, and did so on Master difficulty, and my A Single Thread quest did not progress. Attached is a screen recording of my quest list showing the quest still there, and my Duality seal progress page showing completion.
Has this happened to anyone else? Has anyone completed Duality for the first time on Master and gotten the quest to complete? I'm thinking that it not being done as the normal difficulty may have caused this..
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Despite the wording of the triumph, I can confirm that it only pops when you complete it on Legend. It will not pop for someone whose first completion is on Master.