Should a bachelor’s or master’s thesis include acknowledgements?
Acknowledgments are almost always an optional part of a document that you can choose to include but don't have to. This is true for PhD theses as well as MSc, Diploma theses, or any other kind of document.

The guiding line is: If there are people or institutions who you feel you want to thank or acknowledge their support, then do so. If you think that everyone in your life and your university has let you down, then don't.