BlazBlue: Cross Tag Battle Special Edition

For the achievement you just have to do the following:
When you start the game you have several options to choose the symbol in the middle is the chapters option, when you select it the prologue will start and continue with the blazblue story depending on your ability it can take about 20 minutes to pass it, it takes away how long they are there are so many dialogues, if I don't remember correctly there are 10 chapters the final boss must be the gena that speaks to you from the moment you start the game, once you win the option to do the other campaigns.