Hi! My friend and I have been trying to get the Comrade in Arms achievements (getting Gold in Legendary co-op) but having no luck.
We tried mission 2 but didn’t even come close to the required Gold score - every time we build up a sizable force, we would get hit by the orbital strike and we would need to rebuild our forces.
We tried mission 4, but the enemies keep running away costing us huge amount of time and we barely got half the required score. Par time was 10 minutes and we did it in 20 minutes.