Midnight Crossing

Complete any optional ronin mission with the Midnight difficulty toggle switched on. Midnight is the hardest tier and only unlocks once you've finished the main story, so this is a post-game job by design. Pick a short, easy optional mission you can handle at your endgame build, flip Midnight on and clear it. It's the sternest single trophy in the game, but one mission of your choosing is a world away from a whole Midnight run.