Here is the full list of all 13 Ominous Tales - there are The Forsaken Isle achievements worth 1,000 gamerscore.
Collect all Achievements
Find a way to the forsaken isle
Find Vincent's mansion and the source of his power
Follow the ghost that disappeared behind the wall
Get the spirit wolf out of the way
Make your way into Vincents Mansion
Find the source of Vincent's magical power
Use the power of wolf blood
Free Lady Annabel's soul
Destroy Lord Vincent's magical power
Find all Tormented Souls
Find all Annabel's Diary Pages
Find all scratch marks