Or we realize that achievements are supposed to remain what they are: achievements. Not every achievement is for everyone and just because some players cannot finish it, is absolutely no reason to get rid of them. If anything, I would consider the reserves achievement to be the best achievement we have thus far. I have read so many players who had as goal to complete this achievement and felt rewarded once they did so. If achievements are too easy they stop being rewarding or have any meaningful impact. Plus you totally defeat the purpose of having said achievements.
There are different achievements for different people. Calling this achievement not achievable is very unfair, especially considering more than 15% of players have already completed it.