This expansion saw the change of all the dungeons available at max level being the 8 seasonal dungeons. M0 is not available for every TWW dungeon at the same time.
We never saw the implementation of a Glory of the Algari Dungeon Hero meta achievement, the dungeon meta that has been a standard of each expansion since Wrath of the Lich King.
Now that we have a poll up to ask for our favourite TWW dungeons, and with no repeat season 4 this expansion, there will not be an opportunity for all TWW dungeons to be in rotation at the same time and no Dungeon Meta to complete.
Before the expansion launched there was talk of making feats of strength replacements, but those have not come to pass. (https://www.wowhead.com/news/no-typical-glory-of-the-war-within-dungeon-hero-feats-of-strength-throughout-the-345990)
I hope we see a return of this type of meta for Midnight, as I always enjoyed doing them as a guild group.
It got pushed aside for Glory of the Delver.
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Yeah, I have that feeling as well.
It’s a shame, cuz Glory of the Delver was incredibly easy and didn’t really take any effort to complete.
Maybe they have data suggesting there wasn’t much engagement with the dungeon achievements while they’re current content? I mean, we do still have something at least, even if it’s been watered down to completing each dungeon in each role. Which notably is still impacted by the seasonal rotation until TWW is over. 
If they don’t add a meta achievement, they never need to go back and fix achievements that break when they do the next stat squish
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I assume Blizz knew the dungeons wouldn’t all be available at the same time and realized a meta for it wasn’t going to be feasible because of it.
But GD blames Delves.
Never change, GD. Never change.
I don’t think that’s the reasoning. I think it’s mostly to do with how they decided to do seasonal dungeons for Heroics/Zeroes as well, so not all dungeons would be available during a singular season.
I hope that achievement doesn’t become a FoS with Midnight and that we can go back to it. Would suck to have missed it completely and not be told whatsoever that it was going away.
Like I pointed out though, even the achievements we did get are still impacted by the seasonal rotation. Anyone who played in S1 had to wait until S2 to complete them, and anyone starting now has to wait until the S1 dungeons reappear. If the seasonal rotation was a factor, then why would these new achievements still be affected by it? 
Another possibility is that they just couldn’t be bothered to come up with creative achievement ideas for enough dungeon bosses.