I was wondering with the achievement
Hurry Up: It's Raid Night (10)
Complete the Wings of Liberty campaign under 8 hours of total played mission time on Normal difficulty.
If I am playing and having fun playing the arcade, talking to everyone, checking out all the maps completely how can I get the achievement? Can I re-start the campaign? Does it go by the total times on the maps, so I could go back and beat the map faster? I'm guessing there is a way to go back and get it ( at least I hope). I'm only a little in the game so I'm sure I can still make the 8hrs but if I don't I hope there is a way to re get it.
Thank you in advance for your time!