Hello,
Welcome to MSDN forum.
I am afraid that the issue is out of support range of VS General Question forum which mainly discusses
the usage of Visual Studio IDE such as WPF & SL designer, Visual Studio Guidance Automation Toolkit, Developer Documentation and Help System
and Visual Studio Editor.
As far as I know, in order to develop windows phone 8 app, you need to install Windows Phone 8.0 SDK. If no help, I suggest you conuslt your issue on windows phone development forum for better support like this thread:
http://social.msdn.microsoft.com/Forums/en-US/96f5d84c-d6af-4de9-bfb6-d86b516ab9af/how-to-target-wp-80-from-visual-studio-2013-with-update-2-rc?forum=wpdevelop
Thanks,
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