Is there a list somewhere already? If not, can you list all the permissions available to Windows 8 apps, and what permissions they have by default? This is good info to know you are secure with your data.
App Permissions are Divided into two categories: General Use Capabiltiy and Special Use Capability.
General Use Capability
Special Use Capabiltiy
Special use capabilities are intended for very specific scenarios.
For Windows 10, see https://msdn.microsoft.com/en-us/windows/uwp/packaging/app-capability-declarations :
General-use capabilities :
Device capabilities :
Special and restricted capabilities
I will not enumerate this list here (its quite long), have a look on msdn.