Keyboard Shortcut for the Visual Studio Package Manager Console?
To open the Package Manager Console, hit the following four keys in succession without holding the alt key. This is not exactly a shortcut but works for me.
Alt T N O
You can set one by going to the "TOOLS" menu and choosing "OPTIONS" then then choosing the "Environment -> Keyboard" section.
Then choose the "View.PackageManagerConsole" option from the list box. You type in the search box above the list box to filter it. Then you can set your shortcut key.