Here is the full list of all 20 Sunrider Academy achievements.
Complete Ava's route
Complete all four routes
Win the election with all 560 votes in your favor
Visit the arcade 400 times in a single game
Visit the shrine 400 times in a single game
Visit the science museum 400 times in a single game
Complete Chigara's route
Exercise at the gym 200 times in a single game
Complete Asaga's route
Visit the park 400 times in a single game
Save up a collection of 500 credits
Complete Sola's route
Have a total of 1000 readiness between all your clubs
Have a total of 200 members between all your clubs.
Purchase every single item at the store and shrine
Have 10 hearts with every girl
Go 20 days with your stress over 50
Rank in the 99th percentile on an exam
Successfully flirt with Maray
Complete the game beginning to finish on space whale difficulty