|Level up your M4 all the way to level 10|
The M4 is unlocked from the start, you need around 400 kills depending on headshots and the amount on XP you're getting to reach level 10 with the weapon. You can get this achievement by playing on any map on the game as long as you get kills with the M4. You will unlock attachments for the gun as you progress so make sure to add those as they become available because they will greatly help.
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