This challenge is basically made for Ground Realistic, where you can select your plane and loadout.
I completed it in Ground Arcade, so it’s possible, but if you only care about the challenge, the randomness in this game mode is very frustrating. First, you need helicopters and it’s “only” 50% chance to get them at 8.0 and higher BR. Then you need 3 plane spawn points, which is also not that easy. Then you need your team to dominate the battle, so enemies don’t spawn their helicopters to counter your helicopter.
In Ground Arcade, helicopter spawns are broken and your 3 air points helicopter can be easily intercepted by 1 air point enemy helicopter, because they usually spawn 0.6 km behind you, which doesn’t make sense. And even when you spawn alone, you still can randomly get poor helicopters with short range missiles that barely do any damage, and then enemy SPAA can kill you before you can kill anyone. So it’s like totally random, you need a lot of luck. I didn’t count the exact number of battles, but it took me at least 30 battles to complete this challenge, which is a lot. Much more than expected, especially after I got 3 kills in my very first battle (I got a very good Russian helicopter there with fast one-hit-kill missiles and no enemies spawned behind me, so perfect conditions).
I’m living proof that it’s possible to complete this challenge in Ground Arcade, but I can’t recommend it. It’s just too random and it can be very frustrating. I had a streak of about 10 helicopter battles, where I couldn’t get even one helicopter kill. If I wasn’t such a calm person as I am, I probably would have destroyed my keyboard or something as the tides in these battles kept turning against me. It was a terrible experience, especially since I was also trying to complete the Air and Naval events, so overall I played a lot last week. This game is just designed to frustrate you, and this particular challenge is very annoying, if you’re not playing Ground Realistic.