Context Menu keyboard shortcut

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for example ctrl+4 to focus the hierarchy
now i can select objects with keyboard but how to show context menu

on windows the normal keyboard shortcuts do not seem to work


For anyone that is used to having access keys on Windows everywhere. Using Unity (tested on 2019.3.2f1) there is shortcut manager if you want to assign specific shortcut for a command.
If you want to navigate in the context menu, then each context menu item has an access key corresponding to their first letter.
For example, in the image you posted you can press “C” and each press would toggle between “Copy”, “Create”, “Camera”. In the case of submenus as “Light” you can navigate into them using arrows.