Here's another Back to Karkand achievement guide for Battlefield 3. This one is for 'Third Tour', which requires you to get a kill using only the BTR-90, DPV, and F-35. Oh, these are all vehicles by the way, so you know this is going to be a fun one.
Boot up any Back to Karkand map on any gametype, and go to town on your enemies with these vehicles. And while it seems pretty straight forward, you may want a quick walkthrough. And as luck should have it, there's right below this paragraph!
- Xbox 360: 20G
- PlayStation 3: Bronze trophy