After recently completing the multiplayer grand master challenge, I've started working on the zombies grand master challenge for Borealis and it's too easy.
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To complete the Borealis Grand Master challenge you must complete the following on 36 unique weapons:
300 kills with the Golden Enigma camo
600 kills with the Zircon Scale camo
900 kills with Serpentinite camo
1200 kills with the Borealis Camo

Music in the video as it appears
Glimp, Søren Søstrom, Soul Food Horns Rod's Theme
Enluv, Hoffy Beats, Soul Food Horns Back in Town
Carabide Joao
Phlocalyst, Satyr Azure
Dani Catala, MrAnthony, Porcel, Maria Ivorra Sushi Bar
Erwin Do, yani Effortless
Dani Catalia, MrAnthony Urban Daydreams