Here is the full list of all 13 My Dear Prince achievements.
Momoka meets Aoi
Saya tries to win Aoi over
Mikan shows off her cooking skills
Momoka receives a surprise
Momoka and Aoi go on a picnic
An embarrassed Yukie runs for cover
A crisis occurs - no, really!
Saya gets a scare
A fun day out comes to a close
Yukie confesses
Momoka and Aoi share a private moment together
I'm sure we'll meet again some day
Just like a fairytale