Bloons TD 5

Popping 50,000,000 bloons is easy, but very time consuming. I highly recommend getting this achievement last, as it's possible (and likely) to unlock this naturally by playing the game and getting the other achievements. If the previous statement applies to you, the easiest way to get this achievement is to go on the first beginner level (or which ever you find easiest) with the super monkey building active and play it on casual. Spam agents like bloonsberry bush and bloonsday device while setting up full monkey temple sacrifices and monkey villages next to them for maximum range and power. Simply let the game run and once you beat the last round keep playing on freeplay with auto rounds set up. Once you get to rounds in the 100s purposely lose to restart and do it all over again, as the later rounds have less bloons and more moabs. Rinse and repeat, you will have the cheevo in no time :D