Here is the full list of all 20 If My Heart Had Wings -Flight Diary- achievements.
Open the gallery.
Clear The Day I Found My Wings.
Clear all routes.
View 100% of event scenes.
Clear A Day in the Life.
Clear Unfamiliar Answer.
View 80% of event scenes.
Clear Inexpressible Emotion.
View 60% of event scenes.
View the second opening movie.
Clear Wings of Dreams.
View 40% of event scenes.
Complete first playthrough.
Clear Inherited Wings.
Open the config screen.
View the ending movie.
View 20% of event scenes.
View the first opening movie.
View the first event scene.
Begin the game.