This achievement isn't story related but the way the game pushes you towards the skill it may as well be. When you complete the first level after the tutorial level you will unlock a skill point and the game will push you towards opening up the skills tab and spending your point on the Constructor Hero skill as it is the only skill available to buy. Once you buy the skill your achievement will pop.
If you would like to see a video for this achievement, I will leave mine below.