Got this solo in about 10 minutes:
Start a private multiplayer match with no bots and play as a spy.
Set about capturing and returning the data files you need to win the match, you need 2 to win. Since there are no bots this will be very easy.
Now to boost your stats , concentrate on every area for possible interaction on the way to the data file, you will see while silhouettes as you run through a level with "Y" or B to perform a climb on a drain pipe etc, his as many of these as you can on the way back an forth getting the 2 data files. This will boost your athletic stat I think.
After playing 2 matches I went from 1% to 7 % stats. Also pick a different map each time.