I just got this achievement and its pretty straight forward. I just went to Custom Match and went through all the different play types: Simple Deathmatch, Free For All and Team Objective. Making sure I played a full match of each. I'm not sure if joining one half way through will earn you credit for the play type.
The annoying part of these achievements is that after a certain amount of time, no one wants to do 1 or 2 of the game modes. Making this damn near impossible for those who need them.
abit of help when at main screen or lookin 4 a match, press RB to see ur friends hub. then click friends ladder. then game modes. any u dont have any points in u need to do. once u have points in all u get the achievement. least i did.
and yes im sorry 4 the nooby posts earlier but at least it helps u all so u dont make the same mistake, and helps as u now no u hav to change the simulation.
Ive definately gone thtough them all but ive not definately played a full match and its not popped, considering it says "finish" i suppose ive done something wrong or its just an ass and you have to play a full game of each
All anyone ever wants to play is deathmatch.
and yes im sorry 4 the nooby posts earlier but at least it helps u all so u dont make the same mistake, and helps as u now no u hav to change the simulation.