This is Vetra's loyalty mission. As you progress through the game and keep talking to her, eventually she will send you an email and Kello will alert you that Vetra would like to talk to you.
The mission is called "Means and Ends" and will be located on planet H-047c. I will not spoil the mission for you, it's straightforward as a shooter. Upon completion, Vetra will thank you, you'll get the pop up that you have unlocked her Level Six perks and the achievement will pop. Happy hunting!