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
Gave Pfeffersack the salad
Collected 3 drops
Found 10 inhabitants
Niche4 puzzle solved
Used the Travelstone 3 times
Solved the hand puzzle
Found 5 inhabitants
Opened the portal
Opened the underground
Solved the electric puzzle
Upset the Treefruities
Found the magnifier