I am having the same issue with both it and the level 10 title... Though, I don't recall getting any notification at all for either.
For the Act 1 title you might have to level up without using the Level Booster, but since you can't leave the starter planet until level 7, that's only 3 levels extra.
I must have spent 6 hours doing Act 1. I would like a BW response on whether it's been changed to include Act 2 or something.