Here is the full list of all 15 Sakura Magical Girls achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Unlock all of Hikari's CG scenes.
Unlock all of the CG scenes in the game.
There seems to be more trouble on the horizon.
Defeat an ancient evil.
Finally reach the end of your first day.
Unlock all of Yuki's CG scenes.
Unlock all of Ayame's CG scenes.
Acquire your own wand.
Put an end to a forest sprite's pranks.
Witness the full power of the love laser.
Use negative karma.
Make every available choice in the game.
Enjoy a peaceful cruise with the girls.
See Yuki while she’s doing promotion work.
Learn of Ayame’s past.