You don’t have to do anything specific.
That criterion is quite old.
Adobe Acrobat dates back to 1996/1997. It’s approximately PDF 1.3, and Typst’s default output version is PDF 1.7. The latter is compatible with the former.
Also, fonts are embedded by default.
Note that if you include PDF images in you document, you may have to double check. Including PDF images is a new feature for Typst, so the output PDF might be problematic if the inserted PDF image does not meet the criteria. In that case, you can try re-exporting the PDF image with your browser or Ghostscript. See A PDF image corrupts the PDF output in iOS/Safari? - #2 by Y.D.X for an example.