Hey guys the trophy isnt that hard, but maybe I can help u guys.
Here is my save. Just one outpost left and one of my bodyguards is almost level 50. He kills the orcs fast and is a good help.
Don't know the exact time, but I finished in 53 mins with this save.
Just conquer the last outpost and then I recommend to defeat the two warlords with the most bodyguards.
Then the conquest of the fortrest of Lithlad should be easy going.
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My game version was EU/Definitve Edition from the psn-store. So not sure if this will work for u guys.