Medic Expert Achievement
Online: unlock 3 weapons in the Medic kit
The medic class is the third class you can choose to be as you spawn. It includes a Light Machine Gun, a defibrillator to bring downed teammates back to life (when they yell "CLEAR" and shock your chest), and a health container to restore teammates’ hit points. To unlock more weapons in this class, you must get points with this as your spawned class. (Getting kills/destroying vehicles/destroying M-Com positions/etc).
You need 25,000 XP to unlock the third weapon for this achievement.