Go to Career Mode and start a career with a new player. I started one with Erling Haaland and Manchester City.
Once the mode is loaded up, go to the shopping tab, and cycle through the options.
Decisions - Greet Your Teammates
Shopping - I purchased the first 9 and the trophy popped.
You need to do 10 activities in total, 1 decision and purchasing 9 items and the trophy will unlock!