The quest chain for attunement starts at
Kimoran with the quest
*[46]"
The Nameless Port's History" at coord location (21,20).
Here's the quest sequence that follows:
*[46]
Inspect the Nameless Port
*[46]
Bandit Leader Lamud
*[46]
Stolen Honor
*[46]
Tarnished Silver Necklace
*[46]
Last Wish
*[47]
The Cost of Honor
These are the prequests needed to unlock the quests at Calamus Manor, which start with
Marlow Rhodes, who has you preform various tasks to keep his elderly laborers in line, who end up tricking you into a fake treasure map that sends you to Abandoned Fortress and back. After doing so, you unlock the quest chain at the NPC
Kolodo at coords (32,23) that begins with:
*[47]
Legacy of Inheritance
He leads you to seek out assistance from the pirates at Abandoned Fortress which in turn leads you to the NPC
Kain (a drunken pirate on a ship in the middle of the town) in the quest:
*[48]
Non-existent Clues
Follow his quest chain all the way through to:
*[48]
Truth on a Sheepskin Parchment
After completion of which will get you the quest:
*[50]Dumb Love
Which is the quest you will need to have for attunement to Treasure Trove. There are more quests available in and around the Abandoned Fortress which you can pick up which include tasks needed to be preformed in TT, though this is the only one actually needed for entry.
(Such a shame that this thread is 5 months old... seems like a waste of time now)