KISSMAD: I don't own the game but I have played the demo which has some campaign missions. I was wondering if someone would be kind enough to list all of the 25 offline campaign missions and their objective.
Well, they aren't so unique. All of them are multiplayer maps with different setups, so I don't think there's a reason to list them all. Almost every Gold objective is to complete the level and Silver objective in under the X minutes (which ranges from 5 up to 25 min.), Bronze - to destroy something, usually just all enemy HQs or all enemy buildings (with sole excepetion being to build 5 rocket silos). The silver is the most intresting. It usually includes avoiding destruction or selling of your structures, using (or not using) particular unit type or class, not building somethings et c.
Perhaps, the most notorious mission is Leapfrog, which requiers to destroy rocket turrets building only helicopters (which turrets are great against). I like it, though, it really demands a bit different tactic to what usually works for other missions. I hope there will be more like this one in the future.
KISSMAD: Is it possible to play a map offline with bots?
Yep.