This achievement is unmissable since it is part of the main story and will be among the first few achievements you'll unlock.
To get it simply play through the first chapter of the game. The difficulty does not matter for this achievement. You can play it on easy if you want to or you can jump directly to the hardcore difficulty to work on the difficulty related achievement.
If you get stuck at any point in the mission, please refer to the video walkthrough down below:
Video credit: bK - The Laid Black Gamer
Hope this helps :-)
Any improvements? Please let me know in the comments below