The game is still broken . EA spit out generic responses. Won’t be buying EA or BF again. I have completed Death from above multiple times and game glitches and reduces competition percentage instead of completion of achievement. Not happy after all the time spent trying to see if EA fixed it . Giving up!
a month ago
Sorry to hear about your issue.
Have you completed the achievement you mean and it won't unlock? The "Death from Above" requires you to destroy 5 manned stationary weapons with a Airplane, which is easier said than done since not many player uses stationary weapons.
One tip I can give you is to place dynamites on some of the stationary weapons and then shoot it down with rockets as soon as someone jump into it. Notice that you don't need to destroy all 5 in one round, so you can keep playing and just try to destroy them.
Good luck and reply back for further questions.
You can also see TrueAchievements for more tips and tricks on how to unlock: https://www.trueachievements.com/a263434/death-from-above-achievement