This took me ages! After about 50 tries I managed to get 15 hits using Hong Hua Zhao.
Make use of the spin kick by hitting attack and jump. You can hit multiple enemies if you are in the right place.
It's still infuriating but I managed it.

I hope that helps.

Actually yes - use Hong. Walk almost all the time and run maybe 1-2 times - its easier to control hits. See the pattern how they go out and try. You can make 16 kills actually

Originally posted by MegaDru:

This took me ages! After about 50 tries I managed to get 15 hits using Hong Hua Zhao.
Make use of the spin kick by hitting attack and jump. You can hit multiple enemies if you are in the right place.
It's still infuriating but I managed it.

I hope that helps.

Yeah i tried this method but his spin kick barely hits anyone. The hitbox is so bad...

tips from my experience:
- use hong zhao, she seems to be the fastest, but that might just be my impression.
- i only used head kicks and i got this achievement, so its possible. special moves can hit a few zombies at once, but it take more time to do this.
- last 3 zombies are bugged and cant be kicked. you have to get score before last 3.
- generally i kicked first 3 left to right and then left again and from top to bottom. something like that.
- to kick a zombie you have to stand a little bit behind them above and head, from side it doesnt always work. overall hitbox is awfully small.
- and most important advice - run!!! run to every zombie and eventually youll get it, thats how i did it. youll never make it with walking.

Guys i done it, at my fourth try. With Hong Zhao as some of you said. Running and kicking one way to another, no special attacks. I done this on Very Easy in case it affects in some way. Thank you all for the tips!