From Halopedia, the Halo wiki
YOLO Strats is an achievement in Halo: The Master Chief Collection. It is unlocked by beating the 15 minute par time on the level The Arbiter. The achievement is worth 10 Gamerscore and can be unlocked on any difficulty.
- The achievement is named for the Halo speedrunning meme of using "YOLO (You Only Live Once) Strats," or strategies that risk death for the sake of fast game completion.