According to this update KB we can see what Autodesk says about if Autodesk products are supported on Microsoft Windows 8.
Please check the system requirements for your product to verify compatibility and specific details (for example, some products are supported on the 64-bit version of Windows 8 but not the 32-bit version).
Unless noted otherwise in the system requirements for an individual product, Autodesk 2014 products are supported on the Windows 8 operating system.
For example I found that for example Revit Architecture for Citrix 2014, Autodesk Navisworks 2014, Simulation Moldflow 2014, Autodesk Maya 2014, Autodesk Inventor 2014, Autodesk Alias 2014, 3ds Max 2014, AutoCAD Civil 3D 2014, AutoCAD Plant 3D only mentions Windows 8 64-bit. But who would really use Windows 8 32-bit anyway?
Microsoft Windows Vista: Here’s what Autodesk says: Beginning January 1, 2012, Autodesk will have formally ceased support of the Microsoft Windows Vista Operating System for all new (and upgraded versions) of its products and services released in 2012.
Microsoft Windows XP: Why are you ending support for Windows Vista when XP, an older operating system, is still supported? Through Autodesk’s research and customer engagement, there is still a large population of customers utilizing this Operating System in their work environments. We will work with our customers in the coming 12-24 months to understand their transition plans and make a support decision about Windows XP when it is appropriate to do so.