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