I could not find a list, official or unofficial, of commands that Visual Studio for Mac supports. The list below is all the commands you can keybind from the GUI in Visual Studio. At the bottom, there is an example .vsvimrc that shows how the commands can be used.
To be used in, for example, a .vsvimrc is you’re using VsVim (for Mac, the commands for Windows is different).
nnoremap <leader>pf :vsc MonoDevelop.Ide.Commands.SearchCommands.GotoFile<CR>
nnoremap <leader>ps :vsc MonoDevelop.Ide.Commands.SearchCommands.FindInFiles<CR>
nnoremap <leader>vd :vsc MonoDevelop.Refactoring.RefactoryCommands.GotoDeclaration<CR>
nnoremap <leader>vi :vsc MonoDevelop.Refactoring.RefactoryCommands.GotoImplementation<CR>
nnoremap <leader>vrr :vsc MonoDevelop.Refactoring.RefactoryCommands.FindReferences<CR>
nnoremap <leader>vrn :vsc MonoDevelop.Ide.Commands.EditCommands.Rename<CR>
nnoremap <leader>vca :vsc MonoDevelop.Refactoring.RefactoryCommands.QuickFix<CR>
nnoremap <leader>vh :vsc MonoDevelop.Ide.Commands.TextEditorCommands.ShowQuickInfo<CR>
nnoremap <leader>vn :vsc MonoDevelop.SourceEditor.SourceEditorCommands.NextIssueError<CR>
nnoremap gcc :vsc MonoDevelop.Ide.Commands.EditCommands.ToggleCodeComment<CR>
vnoremap gcc :vsc MonoDevelop.Ide.Commands.EditCommands.ToggleCodeComment<CR>