Big thanks to Mythie for helping to figure out how Blizzard's Mythic+ Scoring system works.
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In Shadowlands Season 2, the Keystone Master achievement is changing to require 2,000 rating which can be obtained by players completing each dungeon at +15 on both Tyrannical and Fortified, each dungeon at a +24 solely on either Fortified or Tyrannical, or a similar combination, making this achievement much harder to obtain.