The unlockable concept art for the Extras' screen.

Effect	How to unlock
Anglo Isles Concept Art	Beat Western Frontier Flashback with all S
Iron Legion Concept Art	Beat Anglo Isles Campaign with all S
Tundran Territories Concept Art	Beat Iron Legion Flashback with all S
Western Frontier Concept Art	Beat Solar Empire Campaign with all S
Xylvania Concept Art	Beat Tundran Territories Campaign with all S