How do you get grand master prestige in advanced warfare?

To achieve Grand Master Prestige in Call of Duty: Advanced Warfare, you first need to reach the maximum Prestige level, which is Prestige Master, by leveling up to level 50 in each of the 15 prestiges. Once you've completed all 15 prestiges, you will unlock Grand Master Prestige. This prestigious level allows you to continue leveling up beyond level 50, earning unique rewards and challenges. Additionally, you'll need to complete specific challenges and achievements to fully enjoy the Grand Master experience.