This is fairly self-explanatory. On starting up a new game, you will pick your Boss for the game and there will be a cutscene with dialogue options for you to pick. Once you’re through that, the tutorial will begin and you will be shown the basics of the game’s combat and how to build up your empire through rackets. The tutorial will culminate in a (very easy) boss fight with another mob boss. Once you complete this you will take over their safehouse, the main tutorial will end and the achievement should pop.