I’ve just completed a nightfall with 108k points and with a lot of Calus-themed gear and I didn’t get the Triumph
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I've done the High Roller Nightfall Triumph on my Warlock and you don't need to use Calus themed gear and weapons in every slot. As I had Lunafaction boots and the Swarm of the Raven on,but everything else was from the Managerie.
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It has to be ALL Leviathan themed gear. You can mix and match from Menagerie and the first 3 Raids. Bad Juju also counts.
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Nighthawk does not count as calus themed.