Make sure you've already finished it in normal as these should be your last achievements. (You could probably beat the last mission on normal to get the achievement).
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.
Last edited by reapermech; 09-18-2016 at 06:14 AM.