Hey there. According to Grandmaster Report you haven't completed any - https://grandmaster.report/user/2/4611686018452140011
Which GM did you do and when?
Probably better just to try one this season - Arms Dealer is in this season's rotation and it's practically a freebie.
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Thank you for the quick reply! Actually i don‘t remember which one it was, i just saw that i‘ve achieved a trophy which requires completing one. Does completing a grandmasters nightfall grant me the trophy although the requirements are showing ‚complete the leviathan raid on prestige? Im a bit of a ‚fear‘ that my PSN haven‘t updated the trophy requirements