Committed To The Cause
Reach level 55 in Multiplayer.

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Multiplayer is accessed from the main menu, and contains a variety of game modes for competitive and cooperative multiplayer. You can also play one of the modes - Wolfpack - solo if you are not a fan of the multiplayer. You will need 526,000 experience to reach level 55. The fastest two ways to earn experience are Wolfpack either solo or with a good group of four, or stun boosting in Manhunt with a group of 6.

Currently you get a daily bonus for XP for the first 20 minutes of play if you played the day before. All XP and credits earned are doubled (including what you earn for accolades and challenges), so you are better off playing at least two rounds of Wolfpack a day to maximize the bonus. If you play Standard Wolfpack solo and never run (unless you get detected and the enemy is fleeing) you can blow through the 25 sequences in about 15 minutes.