Very simple achievement. You'll start out at the main menu, move over to "tutorial" and select it, then select "Blitz".
Once started you will be greeted with a cut-scene of a blitz battle, then you will be thrown into a scrimmage game of Blitz with Captain Cutter giving you tasks to perform that goes over the different aspects of the mode. It's very helpful if you are still struggling at playing Blitz matches.
You can follow along in my video guide below.