Start a new game from the main menu with a different owl than you used before. You needed to have completed the entire game on a previous save file for this to work. There are a total of 4 save slots, one per owl. This will essentially help you keep track of things. When you start a new game and are playing the tutorial, you will gain the achievement. Sadly nothing carries over, it’s literally a new game. You will not want to overwrite your save file thinking things will stay unlocked. The new game will be from scratch.