FarCry 2 had a console editor, but that was created by Ubisoft and not Crytek.
To develop on multiple platforms, the games industry uses Dev Kits which are modified versions of the consoles, these boxes are very different from the standard ones you can buy to play games with, in fact, you can't even use these machines to play normal copies of games!
You can read more about the Xbox Dev Kit here: http://en.wikipedia.org/wiki/Xbox_Development_Kit