How to get 100% completion

Do I need to also complete all proving ground?
I heard there was some platinum medal or something for completion…
I am wondering about going full normal mode no mayhem to complete the cistern of slaughter or the last proven ground I couldn’t finish…

Well if you’re going for platinum you’ll need to do all the proving grounds. For the trophy for completing all the side quests and there is one for the proving grounds specifically

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Alright, thanks!
I might go no Mayhem… just for the sake of completion! :open_mouth: :sweat_smile: