For the achievement you must take both cities and kill their population, this is important for the Destruction path.Nordberg Town
In Nordberg Town after you take the city you will receive a side quest saying 0/100 for dead residents or 0/100 for enslaved residents, you must kill them for this you can hold
aiming at the civilian and hold
until they die, or you can kill them with your weapon, I divide this city into 3 parts, Brown / Red Minions
, Green Minions
and Blue Minions
.Brown / Red Minions
In this part is when you conquer the city with your Brown and Red minions, in it you will have to kill all the civilians who are inside the city, even those who are inside their houses. after that you will notice that the east of the city will have closed gates.Green Minions
To the west you have a barrier with a kind of green poison where you need to remove with your Green Minions, after that kill everyone who is there.Blue Minions
To the east you will have closed gates and to reach them you will have to go north of Norberg Town where there is a boat that you can only use with your Blue Minions that pushed the boat towards you.Everlight Town
Here you will have to do the same thing as in Nordberg Town and 80 in the beginning, the other 20 you will have to do the side quest "Rebellion in Everlight"
to clear the way for another part of the City.Rebellion in Everlight
Here you will have to kill some enemies in the beginning, right after destroying the first barricade with the bombs that the enemies are throwing at you, later on you will have a bridge, use your red minions and position them with
to destroy all the civilians on this last bridge, so you can kill the last 20 inhabitants of Everlight Town.