This achievement can be unlocked on
Stage 6 - Chinatown. See the vídeo for more.
In the middle of the stage, after defeating the white kimono fighter, you will enter a antique weapon room.
There's a spear on the floor, if you lose that spear don't worry, enemies will charge you with spears, simply hit then till the weapon fall, just take it and attack the enemies.
The spear will brake around 10 hits, unlocking the achievement.