Here is the full list of all 15 Kinkoi: Golden Time achievements.
Get all Achievements
Finish Maria's Route
Start Maria's Route
Finish Append Reina
Finish Append Sylvie
Finish Append Elle
Finish Append Mina
Finish Append Ria
Finish Mina's Route
Finish Append Akane
Finish Ayaka's Route
Start Mina's Route
Complete the prologue
Start Ayaka's Route
Start the game