This achievement can be a little tricky to boost because you need to make at least 1 save in the match to get 100% saving accuracy (no saves will result in 0%) but at the same time you don't want to get overwhelmed and have to deal with too many shots because otherwise you risk conceding. I found a good way to boost this is to create the Boosting Formation (see the video guide for "Rising Talent") then go to Kick Off -> BE A PRO: GOALKEEPER to set-up the valid match type for this achievement. You will want to play as Brazil (with Julio Cesar as goalkeeper) and play against Charlton Athletic of the English nPower League 1. Before the match starts however, you will want to go to Team Management and give yourself, Brazil and the Boosting Formation. You will also want to go to Match Settings and ensure that on the Xbox Controller page, you have save assistance, and any other assistance you think will help you, On. The 'Be a Pro' settings page will also have some assistance that you can toggle On or Off. You will want to use Semi-Pro difficulty to ensure your opponents are competent enough to make a good forward pass and take a shot.
When the match starts, keep pressing until your balance is 'Ultra Offensive', now Brazil should be playing really high with only 1 defender. This should allow Charlton an opportunity early on to take a shot. If it goes in, it happens early so restarting the match shouldn't be an issue, if you make the save then you will want to change Brazil's tactics once again. You will want to pause the game and go to Team Management then change Brazil's formation to something defensive like 5-4-1, this should help prevent Charlton from building any more attacks that could potentially see you concede a goal and void your achievement. Once you've done this return to the game and keep pressing until your balance is 'Ultra Defensive'. To further reduce Charlton's chances to score, if you get the ball you can just keep running it up and down your side of the field until Half/Full-Time. The achievement will unlock on the post-match stats page if you kept a clean sheet and made a save. Note that if the game ends 0-0 then you should just end the match as a draw instead of playing extra-time and the achievement will still unlock.