I would strongly advise you do this achievement on a custom portal server against AI rather than in a public lobby.
Set your custom portal to conquest, pick any map (I did it on orbital), put vehicle spawn delay multiplier to 0, vehicle health to max, and have 30 PVE AI all on beginner difficulty. Keep other settings as default.
On conquest you can get vehicles from your spawn. Choose any helicopter and then fly to where the other AI team is. Simply ‘squash/run over’ any opponent AI with your helicopter and the achievement will be yours.
The default helicopter controls are horrible in my opinion so it is a bit finicky at first
This Twitter link shows me obtaining the achievement:
https://twitter.com/spray_uk/status/1459092407950233601?s=21