The best way to get this achievement is during the first year of Career mode.
Prior to competing in the Australian Open you should play the minor tournament (as opposed to the training or exhibition match), to get yourself used to the gameplay. An alternative is to play a couple of exhibition matches prior to entering Career mode, so that it will not affect your attempt at the Collector achievement.
In the first year, winning a tournament is extremely easy. Obviously, the shorter the matches, the better. A simple serve to the outside of the service square, followed by a volley to the open court will win you majority of the points on your own serve. To win on your opponents serve, simply hit it deep to the corner that your opponent is serving from. As soon as you hit the ball, you should immediately run to the net; so, when the return shot is hit, it is a simple volley into the open side of the court.
The level of play from your opponent does not increase by any noticeable level in the first year; so, you can use this tactic all the way through to win the tournament. This achievement should pop when you make it to the semi-finals; however, there are some times that you may have to wait until the final.
Using this tactic, you should also get the following achievements:
Clean Break
Silver Set
Broke
Never Broken
No Set Lost
Australian Open Title