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Chapter Master

Get a Multiplayer character to Lvl 40.

Chapter Master0
4 guidesOnline Game Mode - These achievements require a connection to live services, such as Xbox Live, for playing an online game mode, for sharing content, accessing leaderboards, or validating data with a server.Cooperative - These achievements can be obtained by two or more players in a cooperative game mode who have met the achievement requirements.Versus - These achievements can be obtained by two or more players in a face off gamemode who have met the achievement requirements.Level - These achievements must be obtained by levelling up in-game components.
HolyWarr27HolyWarr27553,974
28 Jan 2014
2 0 0
You will get this long before the Keeper of the Armory Achievement - all weapon challenges. So if you are going for that, do not worry about boosting this separately.

In a 15 min match 1 vs 3 you should be getting around 20k minimum (depending on what weapon challenges you are going for) plus any additional xp for challenges completed. This is by far the most efficient way to get this if you also plan on getting the Keeper of the Armory, otherwise one of the other solutions would be better suited for you.

To give you an idea on potential xp earned with more people in a boosting session - I had an 80k round for 1 vs 5 --- 499 kills and completing both Power Axe and Thunder Hammer challenges all in one 15 mins round