When you finish a quest and the pop up shows your boosts, It looks like you should be able to close it by tapping anywhere on the screen, but you have to hit the back button to do it. The different boosts are all clickable, also, but don't lead anywhere.
Suggestion: when the achievement pop up shows, make it so that a tap on the screen will close it. Make the boost links active OR make them plain text. We literally just had a conversation about this at work for our interface yesterday.