Halo Wars 2
126 Achievements
1,750
38-46h
PC
Comrades in arms
Earned a gold medal on any mission (except Prologue) in Co-op on Legendary
20
0.99%
How to unlock the Comrades in arms achievement in Halo Wars 2 - Definitive Guide
BiggD, DEG23
Refer above to "Palmer's Pure Gold" for more information.
As is evident here, though, this achievement must be done in a Co-Op playthrough of a mission on the Legendary difficulty.
