Edit: TDM matches also count for the wins!
Not a true guide as much is it is just to confirm that the new game mode 'Faction War' does indeed count for the wins. With 4 teams your odds of winning are 25%.
My strategy was to get a maxed Skybreaker and fire it towards large groups of enemies, usually in large pools trying to revive others, leading to a complete comeback in some cases. Doing this much damage and hitting so many people you can easily earn 'Are You Not Entertained?', I also made sure to revive my teammates as often and as soon as possible allowing you to easily get the revives needed for the 'Leave No One Behind!' achievement. The ball wasn't very helpful here given the amount of people but I found it useful on occasion. I found myself using invisibility/teleport or invulnerability/slam combos though magnet was actually very useful paired with the Skybreaker.
Good luck on the wins boys, you got until September 1st when the game mode goes away!