Iustitia, Giver of Life (Achievement/Trophy)

Iustitia, Giver of Life is an achievement/trophy in the first Bayonetta game, that is unlocked by defeating Iustitia on any difficulty.

Description
"Defeat Iustitia on any difficulty "

Guide
Just beat Iustitia on any difficulty. If you are struggling you can be on Easy or Very Easy until you're ready for the harder settings.

Here is the wiki Walkthrough (Normal Difficulty).