View a milestone from your friend feed
Before doing this achievement you will need to head over to trueachievements.com and ensure that your account has milestones activated for your friends feed. If you do not have milestones activated, you will not see any milestones and will not be able to unlock the achievement. On the main screen for the app, press the to get the 'Friend Feed' to take the center of the screen. Now find a milestone (completed # of games, TA score, gamerscore, achievement streak, ect). Once you find it, click on it and the achievement will unlock.