Here is the full list of all 15 Renai X Royale - there are Love's a Battle achievements.
Start the game for the first time
Start Renna Route
End Renna Route
Start Mari Route
End Mari Route
Start Shione Route
End Shione Route
Start Yuna Route
End Yuna Route
Start Nonoka Route
End Nonoka Route
Ao Bad End
End Ikuyo Route
End Chiya Route
End Yoshinori Route