Milestones are gaming activities where you can earn points by completing tasks specified in the milestone descriptions, and earn rewards. The more points you earn, the higher levels within the milestones you'll reach, and the more valuable prizes you can obtain. The points required to reach each milestone level are indicated right below the level number. Tasks and the points available for completing them can be viewed by tapping the 'i' icon on the milestone card, as well as within the milestone window.
IMPORTANT! All milestones are time-limited. The time remaining for each milestone is indicated below its card. If there's no timer displayed under the card and the green 'Go' button has changed to a grey 'View', it means the milestone has ended, and you won't be able to earn points in it.