I know I’ve gotten three kills, one on each weapon, in a single life and yet the Triumph has no progress on it. If it requires single life progress, anyway. Either it’s tracking different to its requirements, or it’s not tracking at all.
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I did it last weekend in Control and did it in 5 straight back to back matches. While it shouldn't matter which playlist you do it in, are you by chance doing it in Iron Banner? If so, you might try regular control.