This achievement is Support Efficiency worth 30G
For this achievement you need to obtain the 4 support effiency ribbons. This isn't too hard to do, as long as you focus on helping your teammates.
The Medical Efficiency Ribon requires you to get 5 Revives in 1 match. This is under the assualt class. You will first have to rank up to attain the Defibrillator. The "Defib" is the first gadget you will unlock in the assualt class. Once you have the defib, look for soldiers who recently just died. They will have a lightning looking bolt above there head. This means they can be revived. Just start reviving your teammates and you will have this ribbon after 5 revives. The "Defib" requires 4,000 pionts in the Assualt Class.
The Maintenance Efficiency Ribbon requires you to get 7 repairs in one match. This is under the engineer class. You will automatically start with the repair tool. Just repair a teammates vehicle, while they are inside it, to obtain points. If your following a tank you can keep repairing it while it takes damage and obtain the ribbon off one vehicle.
The Resupply Efficiency Ribbon is for getting 7 Resupplies in one match. This is under the support class, and like the engineer, you will start with ammo bags. When playing as this class, just throw your ammo bags down for anyone with a mag symbol above there head and they will automatically resupply. Do this 7 times in one match to obtain this ribbon.
The Surveillance Efficiency Ribbon is for getting 5 Motion Sensor Assists in one match. This is under the Recon class, and like the assualt, you will need to rank up to obtain the required gadget. Use the MAV which is a mini flying helicopter that uses an IRNV camera to show enemies. This is much easier since you can fly to the hot spot action and just start marking enemies for your team. Do this 5 times with the gadget and you will have your ribbon. The MAV requires 45,000 points in the Recon Class.
NOTE - As of the Back to Karkand Update, you can get the Surveillance Ribbon with a T-Ugs. Thanks to BloodngunsMrphy.
This achievement is fairly easy, but might take some time. If you think there is anything I have left out, let me know and I will update the solution. If your going to vote negatively, at least post why.