There is a desire to create a goal for face-to-face contacts specifically. While we can create a goal for all contact types, it is currently not possible to create a goal for a specific contact type.
Hi Susannah, thanks for the feedback! Having more granular goal types is a great suggestion and we'll definitely keep it in mind. While not exactly what you're requesting, you can also create a path around face-to-face contacts (i.e. step 1: should be contacted, step 2: contacted), and then create a goal around having that path completed. You could then detail that the path completes only with a face-to-face contact.
For more info on paths, you can see: http://nationbuilder.com/create_paths and http://nationbuilder.com/goals_dashboard#paths