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