It's difficult to say. Do you mean all of traditional Acadia e.g. otl (Nova Scotia (Insular), New Brunswick and Northeastern Maine (Continental)? imo it's a lot easier for Continental Acadia to stay French for longer, but anything is possible.
The big problem is, there aren't a ton of people settling there to begin with. Acadia had only maybe 10,000ish people in the territory at any one time. For most of its existence, it was really small- a census in 1713 I think had it pegged around 2,500 heads (it was probably off by a lot). Acadia is also a complete backwater in New France, as if New France wasn't neglected enough. The few French peasants that settled there were practically left to their own devices, and they really had no contact with anyone. Port Royale was their biggest city, and it was kind of a joke: one of the first established sites for colonization in the Americas and it was just a casual raiding spot for Americans from New England come war time. It was also a lot of bogs (continental) or saline farm land iirc, which had to be drained- making the initial years of settlement rather hard. The native Mik'maq were also fairly hostile, and yeah. It didn't have a ton of worth at the time, so in negotiations it would probably one of the first things to go..
If you want to keep it in the hands of the French, I'd say change the way New France is settled period. If the government had put together any sort of coherent colonial policy when it came to settlement it would give their colonies a much better chance at succeeding. At the very least, definitely avoid the expulsion in '55.
If you're feeling really tricky, you could have Acadia re-established as a French province if Louisbourg is not demolished during the Seven Years' War. Had the French navy been more regular in protecting the colony it likely could've survived much of the war, and a Franco-Russian victory in the Seven Years' War on the Continent, as well as more French succes in India is not at all unthinkable. I suppose even if it ends up demolished they could rebuild it- but my point is, had they won more they likely wouldn't have had to give up the Island, which was actually a really significant trading post for New France. King Louis XIV actually put money into the project (a lot actually, there's a famous quote by him musing over whether he'll see its battlements over the Atlantic) and it was a great pit-stop for trade to the Caribbean. Uh, going back to my point, Île-Royale (Cape Breton Island) was traditionally apart of Acadia, and with French victories in said war, it could easily end up just being called that.