This list is from 2005, so it may lack some stuff, still maybe it can help you:
A more exact list would be found in the Photoshop SDK. See PITerminology.h and PIStringTerminology.h. Some of our plug-ins and 3rd party plug-ins have their own keys and strings. For the application features 99% of them should be in those two files.
xtools/xlib/PSConstants.js is autogenerated from those two header files. This lets you do things like
PSString["3DCreatePostcard"] PSString.AntialiasGloss PSEnum.ModeGray PSEvent.Equalize PSKey.BevelEmboss
I regenerate the file for each new rev of the SDK. As Tom said, most of the terms are in there. Noticably missing are terms for Save For Web...