Just some tips for anyone doing this on Windows 8 or higher (or may have crashing issues):
I had the issue that when finishing the level (Difficulty was Legendary for anyone wondering) after the credits and the cut scene my graphics drivers would crash and then my pc fully crashed.
After a couple of tests, the solution that fixed it for me was as follows:
Under Compatibility Properties:
- Run this program in compatibility mode for: Windows Vista
- Disable full-screen optimisations
Monitor settings:
- Changing the Monitors refresh rate to 60hz
In Game:
- Running the game in windowed mode.
For me, only after doing these steps my PC didn't crash, and I got the achievement. Hope this can help someone.