So those three quests are still "hanging" on your KK achievement window? Not any more! Just follow the first quest from this chain which will lead you to the others:
The Hunter
x 1730, y 430
quest giver: Note (Ghost Hill)
...will lead you to...
The Hanging Tree
x 1550, y 305 (Graveyard)
quest giver: Grave
...will lead you to...
The Lash of the Heavens
x 1637, y 609 (Field of Stones)
quest giver: Zhaoji (NPC)
quest item: Iron Key (x 1904, x 588)
Tadaaaa! Gratz to you and your KK achievements