Blizzard added a new achievement line with today’s build: Resilient Keystone! As previewed in their earlier blog about Mythic+ changes in Season 2, once you complete all dungeons at +12 or higher, your keystone can no longer drop below that level. To better track this, there are separate achievements, one for each keystone level starting at +12.
New Resilient Keystone Achievements
NEW Complete all Mythic+ dungeons within the time limit at keystone level 12 during The War Within Season Two.
