If you have played this game online you will have noticed that people are only playing TDM and FFA so getting the challenge master achievement is going to be pretty tough without boosting so on that note is anyone interested in boosting this achievement with me? I already have a few people that are helping out with this and we are all working towards the achievement. It can however be difficult to get enough people all together at the same time so we are looking for more people to help. We will all continue to play until every member of the group has the achievement. My gamertag is IIII Aaron IIII That is four upper case i's. I look forward to playing with you guys.