High Score 94 (15)
In Zombies Rush, obtain a Personal Score of 250,000
This achievement is easy if you now the map. I did it on my first try.
To start I like the map classified.
for weapons you want the winters howl / furry & the ICR-7 or Titan.
the perks are really up to you. I recommend Dying wish & Stone cold strong hold.
Try to build you multiplier as much as you can before you enter Groom Lake. Groom Lake is the hardest room for me, however it is were Pack A Punch is. Remember to grab the shield in the 2nd room when you start the game, and use the box every 30 seconds till you get the guns you want. Here is the video of me unlocking this achievements on the first try. If you have any questions just ask.