True Nightrunner Trophy in Dying Light 2 Stay Human
Complete all Nightrunner Trials.
How to unlock True NightrunnerThere are 10 Nightrunner Trials in the game, these are Parkour challenges and you need to at least get a bronze medal in each of them. Some of them might not be available until late in the story and some others will requires the paraglider or grappling hook.
See Pilgrim's Path for some maps with their locations (circled in red).