Frag bomb for Bloons Tower Defense for killing 100 enemies in Raze 2? You should put a challenge to win or unlock the teleport ability or the credit cannon
'Lighting Fast' is a pretty hard achievement. And it will get even more hard with the time. You should, or increase a lot it's reward, or make it dissappear
 "Boxhead the Christmas Nightmare"){kind=icon}
 "Raze 2"){kind=icon}
 "Pandemic 2"){kind=icon}
 "Mutilate-a-doll"){kind=icon}
 "The Visitor Returns"){kind=icon}
 "Invertion"){kind=icon}
 "Wheel Burrow"){kind=icon}
 "Justin Bieber Dressup"){kind=icon}
 "Bullet Heaven"){kind=icon}
 "Earn to Die"){kind=icon}
 "K.O.L.M. 2"){kind=icon}
 "Focus"){kind=icon}
 "Freeway Fury 2"){kind=icon}
 "Pixelvania Racing"){kind=tracking}
 "Lab of the Dead"){kind=icon}
Not everything is easy in life :P But we are likely to a) add more levels and b) reset highscores.