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As of Beyond Light, the Leviathan raid is no longer in the game, so Bungie changed the requirements of this achievement to: Complete a Nightfall strike on Grandmaster difficulty.

If you didn't get to complete the Leviathan raid on Prestige (an amazing experience, I might say), getting this might be less or more complicated depending on how much you enjoy harder content. Nightfall rotations change every season, but there's always 6.

Grandmaster Nightfalls are some of the hardest PVE experience currently in the game, but with enough practice and a coordinated team, you can easily complete even the harder ones.

Considering the rotation of different strikes, some will obviously be easier than others.
I consider practicing with some good builds and then giving it a try.