This issue is currently being worked on by the developer team
VorlonFCW
Retired from Bytro staff as of November 30, 2020.
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I have played a couple of games so far that are ranked (for instance, my victories over heavy tanks have been increased on my achievements tab) where my attacks with tactical bombers and regular artillery are no longer increasing my tally/score on my achievements page. And yes, these defeats of enemy units are against active players.
Specific instance: I am playing in game 2,787,307 against West Ontario (who is active) and bombing lots of his units with tactical bombers, but my "Carpetbomber" total has not increased the entire game (and we are now on day 1
. This is annoying, and eventually will result in me not getting gold for achieving the next milestone - because I can't get to it.
The same thing is happening with my "Artillery Aficionado" tally. It has not increased the entire came either.
I believe the same thing happened in game 2,777,302 as well. That was an "Event" game, so I'm not sure if that was a ranked game.
cheers,
Brian aka Braveheart23 
This issue is currently being worked on by the developer team
Dunno if this was fixed. Was able to finally complete achievement of killing x enemy infantry units. Just wanted to see if others are still having problems.
Major problems here. Somehow missed this thread and made my own.
It's messed up pretty much across the board.
My thread:
Yeah I still seem to have problems with artillery achievements so it's definitely not fixed in full.
The rest of the fix should be included in the next update, possibly next week, although it could end up being the following week.
Read the release notes when they come out, and it should mention the bugs that are fixed. 
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