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