Midnight Conqueror: Season 2 keeps the changes that were added in Shadowlands Season Four. Now you have to do dungeons on both Tyrannical and Fortified affixes and get a 1500 mythic+ rating. But since you can only have one keystone at a time and random runs can be rather ruthless, we are ready to offer you help with this task.
This is the fastest and easiest way to get this achievement and by the time we are done with it, you should have enough gear and experience to have a shot on the higher Mythic+ keystones or even a Midnight Conqueror: Season 2 achievement.
Midnight Conqueror: Season 2 rewards: