This title update is free for Sunset Overdrive, and comes with one achievement
Overall the update added DLC, and this achievement was moved into this category, as you do not need the DLC to unlock it, who doesn't like new achievements that don't require DLC?
It's very easy to do, you just need someone else with this achievement!
The DLC itself needs to be bought separately, which you should do anyway, it's an easy DLC to complete
This update did not affect the game at all, however, title update 2 did
Sadely, you will need a gold membership to do this, as Chaos Squad is a multiplayer feature, but it is also very fun, you should try it out
10/10, an easy 25g completion