To start a fantasy draft, from the main menu, click on Fantasy and then New. Scroll down and turn Fantasy Draft On. You can make the other settings whatever you want, I suggest turning Budget Off. Pick whichever team you want and then you will be brought to the draft. There are 25 rounds in the draft and you have to go through all of them. It does not take that long though. Do not sim to the end of the draft or you will not get the achievement. You have to play through all of the rounds. It does not matter what players you draft, just pick the top player all the time to make it go faster.