Here is the full list of all 20 Adventure of a Lifetime achievements.
Complete Chisa's route.
Complete all routes.
View 100% of all event CG.
View 80% of all event CG.
Play to the end of the game.
Complete Emily's route.
Watch the ending movie.
View 60% of all event CG.
Finish the common route.
Watch the opening movie.
View 40% of all event CG.
View 20% of all event CG.
Reach the end of the prologue.
First tip is displayed.
View your first event CG.
Start the game.
Open the tips screen.
Open the sound screen.
Open the gallery.
Open the config screen.