In Player Career Mode, you must go to the “Activities” Tab and do 10 Activities. It counts Decisions as well as Shopping Activities. Here’s a quick way to get it in a few minutes:
From the Main Menu select “Play Modes” > New Career > Use Initial Squads >
Play as a Real Player > Advance > pick team: “France: Paris SG” >
to Advance > make sure Donnarumma is selected and press
Advance (don’t change any settings on this screen) > Yes >
to Advance > Create new Career > Enter Name > confirm > in 1st screen press
to switch from “Decisions” screen to “Shopping” screen > Buy the 9 Items to complete 9 Activities > press
to leave the Menu and advance through the tutorial screens, then choose “Advance” > simulate until the day or 2 before the 1st match > before playing the 1st match go back to “Activities” tab > Decisions > select “Greet Your Teammates” > cheevo unlocks (bought 9 Shopping Activities + did Greet your Teammates).
It was a delayed pop for me, around a minute or so. Most times when you simulate to before the game more Shopping and Investment options appear, you can also spam them as they count too!
Guide taken from PowerPyx site and edited accordingly