For this achievement you are required to change and select a torso with the

5 times.
Once you are in the hub area but outside the ship as this will not let you fast travel to customer, so press the start button you will see the below image:
Now scrolling to “Go To Customiser” and select and confirm with

.
Or you can travel to the prison by foot and enter area if preferred.
Now you will spawn here:
Enter a customiser by tapping the

button, now select a chart to customise with

.
Now do the following:
Press

on the Custom Character
Press

on the Appearance
With your analogue stock scroll down 3 tiles and right 1 tiles to, body and press

Press

on body pieces twice
Now just select 5 different body pieces by selecting with

button.
As soon as you have done 5 pop achievement unlocked, you do not need to save you can just quit and no save.
Congratulations!
Happy Hunting