Thankfully, this game has a kick feature. So when boosting and someone that's not part of the session joins all you guys vote to kick and he can't return to that lobby anymore.
What I meant was that if you play Online, and half way during the match you have to leave you don't get to keep what you earned during that game up to that point. If you got from LVL 20 > 21 in the middle of a match, but you left, you go back to LVL 20.
Small Update: I got Lifesaver Online yesterday so I can confirm that it's possible to get it Online/Offline.
Last edited by Ayx; 03-05-2012 at 02:02 PM.