If you're not very good at battle royales, I recommend doing this in duos. Alternately, if you are, solo is definitely the way to go.
I'd also advise dropping the very first moment you can, going straight down, and then to the nearest 'built up' area, such as sentinel hold, old manor, etc. A lot of bot players will drop there for easy kills.
As the achievement states, you need to get MORE than 10 kills, so you need to get 11 at the very least.
You don't have to turn the enemies into chickens, you just need to kill them when they have been turned into chickens.
If you're in duos, have a friend help you by chickening the enemy, and then letting you get the kills.
There's not much else I can say with this to be honest, just keep working with a friend, and you'll get it.