For this one, make sure you are using the player that makes the tackle (using to switch players). If you get a free kick from the tackle, then that counts as an effective tackle. (Holding the Ball = Good, Too High and In the Back = Bad.)
Use the opposition as a second controller to make it a bit easier to get.
It’s also easiest to get after the opposition has been told to play on. If you are using two controllers, run too far with the ball by sprinting with , giving them a free kick. Then, once the umpire calls for play on, run forward and tackle them.