To unlock the Aim for the Stars trophy in FIFA 19, you will need to qualify for the last 16 of the UEFA Champions League.
The quickest way to unlock this trophy is to select UEFA Champions League mode from the main menu. Select Real Madrid as your team, advance to the next screen where you have the option to Play Match and use
to change it to Sim Match.
You should easily qualify for the round of 16 doing this, but if you want to make sure, you can save after each match. When you win your first game, you will unlock the trophy below:
The trophy for qualifying for the last 16 will unlock once you have finished all 6 group games.