Ok I see there are 3 other guides, and recently got this and thought I’d add a more detailed method with useful images and guidance to help as I personally found this very hard as not a flying gamer.From the
Main Menu set up your planes and move your bombers to the middle of the 3 slots, unless unlocked more variations of planes.
If so add to each of the 3 allocated slots, as shown below:
Axis: Allied: Character Set Up (Support Class): Now set up your character which is best to be the Support Class, as this has the AT Mines as default and no ranking up required:
Game Mode Conquest: Multiplayer
Advanced Search
Your set up should look like this and now search.
After each game has ended ensure you quit immediately, then search once again on your preset advanced search on Conquest Arras.
Map Arras Only: From the image above on the Axis side you can see the indication of a propeller with a 2 next to it this is the icon you need to select for your plane with

, you need to be very quick in most games as a lot of gamers want your plane.
Stationary Weapons:Flak 38: Pak 40 (far right): Points to Note1. Do not use any other variant of explosive apart from AT Mines, as other types of explosive eg TNT do not always work and the AT Mine will hit correctly.
2. Two Players to Boost otherwise it will get too confusing, if in a large boosting group as this will get messy and take you a lot longer to gain.
3. (a). Try look for 16 - 32 player games as more change of getting a plane, or being attacked by other planes.
3. (b). Once loaded into a game look on your opposing team for the shortest Gamer Tag, and one of you leave and do a player search and then join off them.
4. (a). If your being killed deploy with your support Class at your spawn location, and sprint forward and on your main path there should be 1 - 3 Stationary Weapon variants. Throw down both of your AT Mines by pushing

and place with

either side of Gun then jump in by pressing

.
4. (b). Now as your opposing team mate fly's near over, shoot up so they can see the flak and direct them into your path.
5. (a). Once you gain access to a plane immediately press

to change weapons to Bombs, then click in the right stick for a better view to fly.
5. (b). Push right with

heading towards the opposing spawn location:
Axis = The right side of
Point B (point of interest - South to North North/West).
Allied = The right side of
Point D (point of interest - North to South South/East).
6. If you miss your target or go for another run on a Stationary Weapon you need to reload your bombs, by flying through the ammo boxes which are in a silhouette form of boxes in two locations in the sky to fly through.
7. The Stationary Weapons will spawn back within a few minutes on being blown up, in there original spawn location to rinse and repeat.
Once you are lined up press

to release your bombs to hit and blow up an Stationary Weapon it will come up at the bottom of screen with points for Stationary Weapon Destroyed with a Red Cog Icon and player killed with a Red/Green Ribbon type Icon, this will give you 1 of 5 a 20% on your completion bar.
As soon as you have done another 4 more times, bleep, blop, achievement unlocked!!!
This does have a slight delay so you are aware!!
Congratulations!!!
Happy Hunting
**Yes a long winded guide but this may help others in the difficulties I had and I know others are having, positive fb welcome if you choose to down vote please explain why in comments so I can adjust for other gamers like yourself Best of Luck with this very hard achievement **