To unlock this achievement you must collect 10 Bone Charms scattered throughout the World.
After you complete the prologue and go to sleep at the Hound Pits after meeting with the Loyalists, you will be transported to an alternate dimension and gifted by the Outsider with the power to Blink and also a very important item for this achievement, The Heart. It will show you to Runes (used to upgrade powers) and importantly, Bone Charms. These Bone Charms will give small benefits such as making opponents have a chance to miss with their pistols, and making potions restore more Mana. Until you buy upgrades from Piero, you'll only be able to equip 3 at a time.
As you play through the game, make sure to periodically equip the Heart and collect any nearby Bone Charms. After you pick up the 10th one, the achievement will pop. You do not have to equip them. I got this achievement by about the 5th Mission
If you downvote, please give me constructive feedback, this is the first guide I've written. :)
*EDIT: Grammar and spelling