I am trying to get completion with a friend on a world he hosts. we both play on steam. When i dupe and item in the super duper in the great oak tree i do not get achievement but my friend does.

Has the same issue today with super dupe and the coziness achievement. Easy fix for some reason it didn’t work when I joined his server so create a local copy log in, use the dupe machine again and it will work. Same with the coziness one just log in and stand in the area for the achievement to pop