Here is the full list of all 19 LoveKami -Useless Goddess- achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Open the config screen.
View the first event scene.
The first tip displays.
Begin the game.
View the opening movie.
View the ending movie.
Open the gallery.
Open sound screen.
Finish the common route.
Complete first playthrough.
Clear Akane's route.
Clear Inori's route.
Clear Maika's route.
Clear all routes.
View 20% of event scenes.
View 40% of event scenes.
View 60% of event scenes.
View 80% of event scenes.
View 100% of event scenes.