You unlock this trophy after completing the Prologue mission "Freeform Training".
To get this trophy you have to play the first two ICA Facility missions, they are Guided Training and Freeform Training. The first one, which is Guided Training, guides you through the mission and helps you to complete it. The last one, which is Freeform Training, requires you to creatively think of a way to tackle the mission, if you can't think properly then you could repeat what you did in the Guided Training mission.
After doing this, you'll unlock "The Result of Previous Training".