Here is the full list of all 16 LEAVES - there are The Journey achievements.
Played the game without interruption
Didn't need any help
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
Found 5 inhabitants
Found the magnifier
Used the Travelstone 3 times
Shooed away the armadillo 3 times
Set the clock
Opened the portal
Vanquished the monster
Upset the Treefruities