Here is the full list of all 10 The Future Radio and the Artificial Pigeons achievements.
Finish Kaguya's Route
Unlock all Achievements
Finish Akina's Route
Start Akina's Route
Start Kaguya's Route
Finish Tsubaki's Route
Start Tsubaki's Route
Finish Mizuki's Route
Start Mizuki's Route
Start the game for the first time