I've found there is too many bugs, i've completed the game and have done all the favours yet I says I have not gotten it, I have checked a seris of guides and they all say i'm doing the right thing so I can't see whats wrong.
99 Dead Balloons
Dude! You just completed the 99 Dead Balloons achievement in Bloons Tower Defense 3 and won the 99 Dead Balloons badge and 30 points!
Going Bananas
Dude! You just completed the Going Bananas achievement in Bloons Tower Defense 3 and won the Going Bananas badge and 15 points!
 "A Small Favor"){kind=icon}
 "Bloons Tower Defense 3"){kind=icon}
 "Super Crazy Guitar Maniac Deluxe 3"){kind=icon}