After over a year of trying to knock out this achievement with little to no success I finally managed to complete it without any boosting on the newly released Wake Island map. Wake Island has a potential 16 stationary emplacements to destroy, making it one of the easier maps to at least attempt to get this achievement on.
Ideally, you'll want to use the variants of the US Corsair and Japanese Zero aircraft that have rockets equipped. They come with four rockets by default, but I'd recommend leveling up the middle specialisation tree on both aircraft to at least level four in order to gain eight rockets by default. You'll also be able to equip the specialisation to allow you to resupply rockets faster if you level into the middle tree beyond level four.
The best way for dealing with stationary emplacements is to get a good deal of height in your aircraft and then perform a dive bomb maneuver, dumping all of your rockets into the target and then flying back to base to resupply. You've got to both destroy the stationary emplacement and kill the player operating it to gain progress towards this achievement. You'll know when you've done it if a red gear icon shows up in your kill feed in the middle of the screen (indicating you've destroyed and also killed your target).
If you're struggling to find any targets on emplacements you can also fire a few rockets at empty ones in order to soften them up a bit on your next pass. Try to play the objective if there are no opposing players on the emplacements as well. If you can deal a great amount of damage to infantry and just be a general pain and annoyance there's a high chance one of them will jump on an anti-air emplacement to take you down.
One of the key things to do is memorise where the emplacements are - especially the anti-air as they can ruin your day.
Once memorised you can expand your mini map by using the back/view button. If you can't see an emplacement outlined in white on the map in the place it should be then there's a good chance it's being operated by an enemy. You can use this info to decide on your attack angle, which can be invaluable when approaching an anti-air emplacement that is looking for you.
Thankfully though I've thought ahead when it comes to helping you figure out where all of the emplacements are! Below is a link to a map I've put together outlining all of the emplacements on Wake Island. I've also listed what each one is below as well.
https://imgur.com/a/3XPK9K41 - Type 10 Artillery Cannon (A Flag)
2 - Type 10 Artillery Cannon (A Flag)
3 - Anti-Air Gun (A Flag)
4 - Anti-Air Gun (B Flag)
5 - Anti-Air Gun (Between B and C Flag)
6 - 6 Pounder Gun (C Flag)
7 - 6 Pounder Gun (C Flag)
8 - 6 Pounder Gun (Between C and D Flag)
9 - Anti-Air Gun (D Flag)
10 - Anti-Air Gun (D Flag)
11 - Anti-Air Gun (F Flag)
12 - Anti-Air Gun (F Flag)
13 - Anti-Air Gun (US Deployment)
14 - Anti-Air Gun (US Deployment)
15 - Anti-Air Gun (US Deployment)
16 - Anti-Air Gun (US Deployment)
As you can see, there are a lot of emplacements on Wake Island and the majority of them are anti-aircraft guns. It should also be noted that the four emplacements in the US Deployment will only be able to be destroyed when playing as the Japanese. You can more often than not spot anti-air emplacements on your attack run as they are entrenched in a circular defensive position which is very visible from the air.
It should also go without saying that if you're not the best pilot in the world and you're being tailed by an enemy aircraft then it can be a good idea to try and lure them into your team (especially if they're on an anti-air gun of their own or also flying an aircraft).
Some of the strategies I've outlined here can also work well on Iwo Jima/Pacific Storm too, though there aren't as many emplacements as Wake Island.
Hopefully this helps someone out and reduces the suffering and annoyance of trying to get this achievement unlocked. :)