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