Several achievements can be easily obtained with this save.
Finish the game on Extreme:
The chapter in the snow with the giant robots is already completed, just finish the remaining chapters.
Pro-bending mini game:
You should only have the last match to complete (it's obviously the hardest part but it's doable after a few retries).
Also helps with a few miscellanous achievements.
Rehash/resign as usual and back up your main profile in case something pops out of order - I haven't tried those saves on a dummy profile.
Please leave feedback if something doesn't work as expected.