I found out what was wrong and how to progress in 2 seconds off of Google.
Almost like it's a widely know issue or something XD
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I think the triumph is bugged LoL I playing with other pules rifles and other playlists and is do not processing
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Again, I know this. Thats what "known issue" means. It's almost like you can find what weapon type actually progresses it by googling.
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You must kill with cry mutiny I watching a YouTube to progress it lol