The way I did this was to keep searching for drop in matches, and only play if it was just you on one team, or if there was like 4 people in the lobby, just wait till they leave.
Once In Pick "ANY" as your position, this means you control the whole team, but can still gain accomplishments very easily. Now as the whole team, just pass to your pro, influence the game, and let him get his stats up, move him around positions, My VP was originally a CAM , but when I changed him to a forward his percentage went up from 14 to 15 , and when I changed him to a GK it went down, so keep finding these matches, and just help your pro, do skills or attempt, dribble round players, through balls, and assists and of goals and you will have both the 10% and 25% achievements in no time.
Took me 6-8 Games I believe. Very simple Just takes a bit of time on a Sunday Afternoon!