It is intended that the quests that provide Stone Keeper's Shards don't count toward the achievement as the goal is to get the achievement by looting them. Yes, the text in the achievement could use an update which we may do in the future, but I have no eta on when that may or may not happen.

Some changes may come to this achievement, but it was confirmed that it is functioning as intended. We may change how it works or the text or just how the achievement is part of the meta, nothing is for sure there, but it isn't a bug.