Here is the full list of all 35 Finding the Soul Orb achievements.
Finish the game.
Shoot the gargoyle of chapter twelve.
Begin chapter twelve.
Begin chapter eleven.
Shoot the gargoyle of chapter ten.
Collect the tenth demon at chapter 10.
Collect the ninth demon at chapter 10.
Begin chapter ten.
Shoot the gargoyle of chapter nine.
Collect the eighth demon at chapter 9.
Begin chapter nine.
Collect the seventh demon at chapter 8.
Shoot the gargoyle of chapter eight.
Collect the sixth demon at chapter 8.
Begin chapter eight.
Begin chapter seven.
Shoot the gargoyle of chapter six.
Begin chapter six.
Shoot the gargoyle of chapter five.
Begin chapter five.
Collect the fifth demon at chapter 4.
Shoot the gargoyle of chapter four.
Equip the better crossbow.
Collect the fourth demon at chapter 4.
Begin chapter four.
Begin chapter three.
Shoot the gargoyle of chapter two.
Collect the third demon at chapter 2.
Collect the second demon at chapter 2.
Kill the first werewolf.
Begin chapter two.
Shoot the gargoyle of chapter one.
Equip the crossbow.
Collect the first demon at chapter 1.
Begin chapter one.