According to map in Wiki, following node is the only one that I'm missing.
Cursed Shore 3 [11436, 26861]
it is south east of Altar of the Withered Heart ([&BBYDAAA=])
A month ago I tried doing this and even though it drops the [Mistborn Mote], it does not credit for achievement.
That day I tried it a few times after waiting few minutes (as suggested in wiki) and still didn't get credit
I tried it again today and it still drops the mote and still no credit. Appreciate if it get fixed.