Sounds to me like you have a parts collection mission holding up your progress. As far as I remember the Riptide blueprints are given out by the mechanic but he will only appear with a new mission when you complete the last batch of missions, usually the parts grind for the purple haired chick in the helmet with the nose piercing is the one holding up progress.Originally Posted by leJeff2014 Go to original post
I don't think ANBA will give you the last Berserker blueprint before you complete the Riptide. As a side note, the mechanic gives you missions to upgrade the Riptide while you progress through the Tier 3 tracks. These are compulsory to progression so get on with them as soon as possible. 3/3/3/3 should get you most of the way.
Enjoy the grind that is about to start!