To unlock the Ghillie suit in Multiplayer mode, select "Weapon
Challenges" to see if the "Chrome Barrel Master" challenge is active. If
it says "Challenge Inactive", go to "Operations", and spend one Squad
Point to get new challenges. Repeat this process until the "Chrome
Barrel Master" challenge is active. Then, complete the "Chrome Barrel
Master" challenge to unlock the Ghillie suit.