Shiro
20 Achievements
3,000
1-3h
PC
Nimble Sword V
Defeat 25 enemies
200
87.54%
How to unlock the Nimble Sword V achievement in Shiro - Definitive Guide
You can just start a new game and shoot all the birds in the flying section with . Then continue on to the forest location and kill some enemies there (using ) until this unlocks. If you want can even kill the person shooting at you (which is past a checkpoint), die in the spikes and kill him again.
Guide isn't really needed, but just in case you enjoy visual example: