I personally did this with the US M4 Sherman--I love the 90mm cannon on that tank as it's almost always a 1-hit kill on lower tier tanks especially if you hit them in the right spots.
I was losing a match terribly, but sneaked around the map to their base, came across two artillery, took one out, switched ammo immediately with
and got the other one before he could hit me twice.
Artillery works well for others, but I just don't like the artillery style.
Don't forget to equip two different types of ammo--go to your "Upgrade" for the tank you want to do the achievement with, go to "Consumables", then buy another variety of ammo. Don't forget, you can switch from gold to silver for ammo with the
button, but premium ammo costs a LOT of silver per round so I recommend finding a tank with two non-premium rounds.