Here is the full list of all 20 Love on Leave achievements.
Clear the Amane Route
Clear the Hibiki Route
Clear the Kanami Route
Clear the Harem Ending
Clear the Sage Ending
Clear the Normal Bad Ending
Obtain the Golden Vegetable
Obtain the Golden Fish
Obtain the Golden Bug
Gather all the trash
Get all of the Sage's lost items
Get all of the Menko Cards
Beat all of the townspeople in Menko Cards
Watch all of the vending machine events