Bungie acknowledged that the triumph is bugged since progress is character-based instead of account based like the others. But they’re not doing anything about it? The Guardian Games are gonna end soon and some people are going to miss out on 2 triumphs, including shaders and and an emblem because of this bug and the unbearable grind of old activities it requires on a single character, hurting those who play on 3 characters, which you have to do for other triumphs. The easy solution is to combine progress account wide. Not fixing it is a shitty move in a shitty event.
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It being character based and not account doesn’t make it impossible to complete so it is in fact not keeping you from getting all triumphs.