Here is the full list of all 20 Spirits of Carter Mansion achievements.
The First Key
The Second Key
The Third Key
The Fourth Key
A New Friend
It's Really Gone
Goodbye Friend
A New Toy
A Long Road
Fool Me Thrice
The Objective
Victory
Wanderer's Victory
It Spins Around
No Friends
The Exit Flickers
Not Yet
Decapitated
Investigator
A Wise Choice