Before these achievements and the mount was added to the game, most players would wait for a sizable group to take down A and S rank hunts.
Now people pull extremely early.
This is a direct result of adding a mount to an achievement that requires tons of grinding. It also doesn't help they put Mythic Clan Mark logs on Centurio Seals as well.
It has quickly turned into kill the mobs as fast as you can and don't care about anyone else.
IMHO this was a bad idea by the development team.