After a bit of searching i found this thread that details how to change the input.xml file for the xbox360 controller ui. I do not know if this effects achievment gain(if there are any).
I added it to the post for ease.
Go to your Documents\ArcaniA - Gothic 4/input.xml
Go to the bottom of the file and paste this under the prevoius </Input> but before the last line </Inputs>.
Make sure you follow the spacing that is used on previous input settings.
<Input command="cheat menu" >
<Key code="41" />
<Activation type="first active" />
After this is done press "~" in game to bring up the cheat console and enable the xbox ui.
WARNING: After playing for a while with the Xbox UI enabled I went to open the options menu and the game crashed. I have not had any other crashes so far.