Xbox officially confirms Mythic Achievements, rolling out today to Xbox Insiders

Xbox has officially confirmed Mythic Achievements and detailed how they work, with Xbox Insiders getting an early look starting today. Players earn one by completing all original achievements in a game, DLC or update achievements are not required, and Mythic status is kept permanently, including for eligible Xbox 360 titles completed in the past. A new Gaming tab and a progress bar at the top of each achievement list track progress, with later achievements tagged as add-on, though the rollout is currently limited to the Alpha and Alpha Skip-Ahead rings.