Okay, I just popped this achievement in my GW Tiger P artillery.
I scored four kills in the match, for three of them as the shot was on its way to the target I held left or right on the left stick basically rotating my tank on the spot until impact. The reload time is so long that you can straighten back up for your next shot in time.
As soon as my shot blew up an enemy artillery piece the achievement popped (In game)
Hope this helps some people out as it could be a much easier way of earning the achievement as opposed to rallying around the field hoping to survive