Badlands Legendary Collector will not complete with all card

[Hamshire-1386]

I have all Badlands legendary cards and its stuck at 26/27

[Joachim-22234]

@GnomeSayin-11972

[Added 11/14] [Progression] The Showdown in the Badlands Legendary Achievement is stuck at 26/27. Hold your horses on disenchanting Legendary cards–we’ll get this sorted.

This is mentioned in the patch notes.