Here is the full list of all 16 LEAVES - there are The Journey achievements.
Didn't need any help
Played the game without interruption
Found 15 inhabitants
Opened the Heaven's Gate
Waited for the poison to wear off
Set the masks correctly
Found 10 inhabitants
Opened 3 doors in Eggtown
Used the Travelstone 3 times
Shooed away the armadillo 3 times
Set the clock
Found 5 inhabitants
Opened the portal
Vanquished the monster
Found the magnifier
Upset the Treefruities