As only seasonal dungeons are available on Mythic difficulty, you have until March 4th - The release of Season 2 of The War Within, to get credit on the Season 1 dungeons for the achievements above:
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Last Chance at Algari Dungeoneer Achievement Credits for Season 1 Dungeons
The War Within Season 2 starts on March 4th, and with it, new dungeons will be available to get credit for the Algari Dungeon series of achievements - Which requires you to clear all Khaz Algar dungeons on Mythic difficulty.
