If you prefer not to download external files, v0.20.16 and later versions include a built-in way to unlock content:

How to Download and Install Summertime Saga 0.20 Save Data on Android

Use a file manager (like ZArchiver) to navigate to the Android/data folder. Paste the files into the saves subfolder.

The 0.20 update is one of the most significant releases, primarily introducing the first half of the .

A: Summertime Saga does not have official Google Play achievements, but in-game achievements (like the trophy room) will automatically trigger when the save loads.