I was trying to find out if it is possible to scale a model in Creo to a 1:1 ratio? If so, how would I go about doing that?
I think you mean 1:1 as in real life size. I am pretty sure this is not possible. Everyone has different screen sizes and screen resolutions. There is no way for the software to know how it is being displayed.
Consider a projector for instance. If you were using a projector for your display the software would need to know the throw distance of the projector.
The best you can do is to model a ruler in and then adjust it to real size using that.