Don’t discuss with Snozay, He’s just an alt from a Mage that just have a close opinion that at that moment the achievement wasn’t active because fated raids weren’t active…bla bla bla
I even did a post on July 17th a lot of time before S4 start about LFR acquisition being too easy for a mount that will be rewarded for 1 season and that this mount should be added to the BMAH too. Any player checking wowhead and the last version implemented in the game will assume the same.
That’s why meta achievements say “Normal or higher” and the completion of the raid (story achievement) “Any” because you can complete that achievement via LFR.