I got this in the 3rd match actually trying for it! The scales were tipped in my favor though because I had several things that can be hard to get. I hope this info helps someone out though on a possible way to get this annoying achievement!
I used the Tier 2, T2 Light US Premium Tank. I got that tank for free a while ago while playing on the 360, and chose it for trying for this achievement because it's very very fast, and I had artillery in mind for ramming.
I also had a 100% crew on it that I had been trading between different premium tanks I had gotten for free. Before the few matches trying for this achievement, I switched my one crew skill from Brothers in Arms to Controlled Impact to help with ramming.
Also, I bought 3 equipment for the tank to help out with potential ramming/escaping:
Toolbox:(300,000 silver) +25% repair speed(in case I lost my track, want to be able to escape)
Small Spall Liner: (30,000 silver, 10 gold to remove) +20% armor protection from ramming...) Very important I think.
Improved Ventilation Class 1: (30,000 silver, 10 gold to remove) +5% to all crew skills(wasn't sure how much it would help, but it was the most helpful other equipment I could use!)
I had quite the adrenalin going as I fled the scene of the second tank ramming.... !
I'm including the full game clip
--there's about a minute of nothing after the garage that you can skip, but I wanted to include the garage for a slight visual of my setup.
Unfortunately, somehow xbox deleted some of my SAVED game clips many of which I used for solutions. This was one of them!