Unlock the following concept art at the "Extras" menu by performing the corresponding tasks:
CONCEPT ART - HOW TO UNLOCK Anglo Isles - Beat the Western Frontier Flashback campaign with all "S" ranks. Iron Legion - Beat the Anglo Isles campaign with all "S" ranks. Solar Empire - Beat the Solar Empire campaign. Tundran Territories - Beat the Iron Legion Flashback campaign with all "S" ranks. Western Frontier - Beat the Solar Empire campaign with all "S" ranks. Xylvania - Beat the Tundran Territories campaign with all "S" ranks.