Not only did they do it after this patch which is annoying and stupid, they by all rights should do it on Aug. 3 when the rotation happens. No they even contradict themselves since they urge players to get their achievement hunting done by Aug. 3 but they did it now.
Please note that incomplete Forged in the Barrens Gameplay achievements will no longer grant Reward Track XP once United in Stormwind releases on August 3, at which point the United in Stormwind Gameplay achievements will take over, so don’t forget to finish and claim those before you’ve left the Barrens.
Very fucking annoying. Can someone @ them on twitter or however the devs are easiest reached, I don't use twitter nor care to follow the Devs elsewhere.
I find it annoying that they remove the incredibly minor XP achievements anyway. (They could maybe REDUCE the XP gained from old achievements, but removing them entirely is lame) I really honestly think they should do it two expansions at a time. 3 months is not a ton of time to get these achievements.