The description of hte award doesn’t say that it only applies to player vehicles:

But this is the 2nd game I’ve killed 5 or more, including bots, and not received it. This game was 4 players and 3 bots for 7 kills:

I guess it could be that it is SUPPOSED to be Player vehicles only… in which case it would be a bug in the description.
It’s a bug. If you get 5 player kills you do get it. They didn’t fix it when they made bot boats count the same as player ones in March.
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I got professional at least 2 or 3 times as I completed the “Voroshilov Sharpshooter” with boats.
But for the BP achievement you could only take one per game, it was same with tanks
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Planes counts the multiples correctly. Had a ten-kill for six points against the achievement in one game. Ships counts correctly too, if you only count the human players you killed. I had a nine-kill, five humans, 4 bots, got one point against the achievement.
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Thanks for all the replies - clearly jsut a wording issue - I have received it in NAB now too