This achievement is 'Credit Where Credit Is Due - Watched the credits in full'
To unlock 'Credit Where Credit Is Due - Watched the credits in full' go to Help & Options and choose Credits. It will scroll through the credits for Krome Studios and MS Game Studios. It only takes about a minute or so and once all the credits have scrolled the achievement will pop.
Edit: As mentioned by Always Saucy you can scroll through the credits to make it even quicker and still unlock the achievement