Here is the full list of all 24 Sunny Girl achievements.
Char 1
Char 2
Char 3
Char 4
Char 5
Char 6
Char 7
Char 8
Char 9
Char 10
Char 11
Char 12
Complete Char 1
Complete Char 2
Complete Char 3
Complete Char 4
Complete Char 5
Complete Char 6
Complete Char 7
Complete Char 8
Complete Char 9
Complete Char 10
Complete Char 11
Complete Char 12