From what I understand you still need to be connected to the server in order to advance with the off-line campaign.
http://riseofflight.com/Blogs/post/2...date-1011.aspx
Quote:
IMPORTANT!!! You can get through campaign missions in any mode, ONLINE or OFFLINE. But the next mission will be available only after you complete the previous and your achievements data is sent to master-server. In this case, it might be easier to simply be logged in ONLINE while you play. But the choice is yours.
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