Shuffle by album on iOS-devices?
This is not possible in music.app.

From this Apple Discussion:


  The Foobar2000 music player app available in the App Store respects albums and supports 'Shuffle Albums'. It is a competent, comfortable and convenient music player with full Gain Management and many other useful features. It will work with your iTunes library as well as many other music file formats (via iTunes App File Folders). At time of writing it is free.