So I played through and completed the game on Pro. I now want to go back and unlock all the missing achievements which don't require me to be on a set difficulty.
The only question is how do I do this? Seeing as I've done everything on Pro, this is going to make it a little harder for me and I can't see a difficulty change setting anywhere.
Whenever I select a mission I go straight into it, without the option to change and my guess is as it's a level save from the original game I've been playing, it's set on Pro.
Anyway I can lower it down but still keep the missions?