Restore Byzantium and have Italy, Romania, and Russia as subjects. Set your operatives on 'Establish Spy Network' mission in Casablanca and the achievement will trigger once the network strength is over 50%. Alternatively you can temporarily fight in the Allies' side. You (only) need Stockholm for the achievement.
Installed an American monarchy, Hidden requirement for Installed an American monarchy, Conquered all core territory of China and Manchukuo not including the states of Hong Kong(326), Macau (729) and Guangzhouwan (728). Declare war, remove all your forces from Guatemala and wait for it to capitulate.