There should be an achievement for beating Narinder without taking any damage.

[grand dove]

This achievement should be called life to follow the theme of the achievements' cure, sate, peace, and order.

[bleak robin]

The reason there isn't an achievment for this is likely because you can only fight him once per save file, you can't re-do the battle with narinder so it would make 100%-ing the game a bit tedious