In Zombie Rush, get your score multiplier up to 100

For this achievement you will need to play the new zombies game mode RUSH. I recommend the classified map if you have it. Next start the match & try to keep your multiplier up. Timing is key. If you do not do something like get a kill or pick up a rush points every 25 or so seconds the multiplier will go down. If you take damage the multiplier will go down by half.

Here are some tips to not get hit: 1, grab the shield!!! 2, use the box & pack a punch. they are free & have a 30 second cool down. This may take you a few games to learn the map & the room order but it really is not a bad achievement.

Worth 15 Gamerscore.