Here is the full list of all 16 LEAVES - there are The Return achievements.
Used the Travelstone 3 times
Didn't need any help
Played the game without interruption
Found 15 inhabitants
Niche4 puzzle solved
Pfeffersack sleeps at the noses
Gave Pfeffersack the salad
Solved the hand puzzle
Found 10 inhabitants
Found 5 inhabitants
Opened the portal
Opened the underground
Solved the electric puzzle
Collected 3 drops
Found the magnifier
Upset the Treefruities