Here is the full list of all 17 Anime Artist 2: Lovely Danya achievements.
Unlock all dresses
Unlock the third secret Picture!
Unlock the second secret Picture!
Change Danya's hairstyle
Complete (3 stars) level 12
Complete (3 stars) level 11
Complete (3 stars) level 10
Complete (3 stars) level 9
Complete (3 stars) level 8
Complete (3 stars) level 7
Unlock the first secret Picture!
Complete (3 stars) level 6
Complete (3 stars) level 5
Complete (3 stars) level 4
Complete (3 stars) level 3
Complete (3 stars) level 2
Complete (3 stars) level 1