Here is the full list of all 15 Kinkoi: Golden Loveriche achievements.
Start a new game
Unlock the Hidden Special End
Reach the True End
Finish Sylvia's Route
Finish Ria's Route
Finish Common Route
Start Sylvia's Route
Start Reina's Route
Finish Reina's Route
Start Elle's Route
Finish Elle's Route
Start Ria's Route
Start Akane's Route
Finish Akane's Route
Unlock all Achievements