Easily done with an upgraded Stone stance.
a couple of times to break the enemies resolve and stagger them.
If you're still struggling (which based on the game mechanics you shouldn't be)
For shields, use the water stance.
For spearmen, use the wind stance.
For Brutes, use the moon stance.
NOTE: If you do not see the trophy symbol appear above the head of the enemy, it doesn't count towards to trophy.