Since last season the requirements were different you will most likely need to do one this season for the achievement to pop
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I am confused though, it still said 22/23 achievements when I did the GM last season. It's a steam achievement, not a bungie one. Bungie shows me having the triumph. Still doesn't show me completing a GM in steam.
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Bungie changed the requirements. Last season you needed to do a prestige Leviathan raid since you can't do that any more the requirements were modified to something you can do this season
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Lol I *did* a prestiege levi, I did it to finish legend of acrius...
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That was in 2017 before it was not steam and when it had a different requirement, I believe it was heroic nightfall but also battlenet. Didn't have achievements so it didn't count anything. End of the day the answer to your question is you have to run a grandmaster this season for the achievement