All bosses and minibosses were killed at the end of the return, all parts of the mask were collected, all techniques of all styles were studied, including musin (except for the one that you get in the “sura” ending), all prostheses and skills were pumped to the maximum, a lot of consumables.
Sekiro: Shadows Die Twice: Save Game (All Items, Techniques & Ninjutsu) Free Download
Saving after killing the last boss, the ability to immediately start ng+