National Conquest Achievement
Clear all included game maps.
This will be the last achievement you earn. "Clearing" a map means having $10 billion ($10,000,000,000) in cash on hand. There are eight maps. Each map can be cleared in roughly 30-45 minutes by following the procedure outlined in the road map to build a resource center. If you are trying to get this achievement and nothing else, it would take roughly 4-6 hours, most of which involves waiting while each map earns money.