Sensation, the completion achievements for every raid always mention “any difficulty”, actually you can boost a character, buy some gear with anima and run LFR and you’ll notice that each boss that you kill on each wing provides progress to your raid achievement.
the game doesn’t have completion achievements exclusive to normal, it’s shared with LFR. Therefore, these new achievements that are also for completing the raid but with an affix were consider for both difficulties for a lot of players.
Maizou, thanks for your post, unfortunately similar to the 500mount achievement your thread has like 20+ comment but only between CC members, Devs should at least reply with some changes or embrace their decisions and provide more inputs regarding their “reward philosophy” behind a specific difficulty, there’s a lack of communication with rewards devs.