Wars with Friends Achievement in Halo Infinite
Bring some rescued UNSC Marines along for the ride into a main mission.
This can be done anytime after leaving Outpost Tremonius.
Simply go to any FOB you’ve captured, call in a vehicle, let marines jump in, then drive them to any main mission marker on the map.
- It doesn’t matter if it’s a mission you’ve already completed on this save.
So you can absolutely do that achievement after finishing all the main missions.
The easiest way would be grabbing marines at FOB Golf (the one you have to capture straight after leaving Outpost Tremonius) and driving them to Recovery (the marker just east of the Tower) works.