The emulator? Not particularly difficult, once you have generic drivers for audio and a framebuffer support. Is the same emulator you have on Linux/Windows/OSX PC's .
Just recompile and you are welcome.
The achievement I was referring to was putting Linux on the PS4 so quickly after the console was jail broken.
The emulator itself was a great visual demonstration of "the full linux desktop experience" as opposed to listing "Can emulate video games" as a bullet point.
