Jet Set Radio

This is the first thing you do in the game!

So, start a new game and after Prof. K's intro Gum will have you do a few things like jump on a car (Jump is 'A' button), grind (just jump and land on the rail), and tag a few cars (LT when you have paint). Then she will join you.

Then right after she joins, Tab will want you do copy him too! He will have you do a Large tag (move the stick in the direction it tells you). Then he will have you skitch up the hill (just get close to the back of a moving car), and then finally your first combo!

Once you do that he will join, and the achievement will pop on the following loading screen!