The Dishwasher Dead Samurai

To get this as stated in achievement. Score 100 Million points.

To get big points you need BIG combos.

Easiest way to get this is on:
Arcade level 35) Killing Yard

On this you have 4x Damage and lots of slow ones that will keep spawning.

To do it:

Get as big as a combo as possible at the beginning using Y to slide from side to side and clean kills. Can get around 100 Hit if you get all enemies. Make sure you leave a jetpack guy and then start throwing the slower zombies. Get a chain of zombies at the end and you will be able to get this without a problem. Obviously the bigger the combo you get the less you will need to throw.


Good Luck

Even easier level to do this on is the Robot rampage level of arcade mode, only the massive bipedal and normal size ones spawn, 21 in all 4 of which are the large ones, you get a maxed sword and the extra is half speed on the enemy.
Essentially the tactic is the same as the other two mentioned but this will take you around 1:30 with max combo anywhere from 350 plus.
The advantage of this levle over the killing ground is the sword allows you to warp when you've been hit, making it far easier to keep the combo going rather than losing it due to getting hit.
Oh score i actually got was 121,357,150 you can get more if you avoid getting hit etc

I actually got this achievement by playing on the Dish Challenge. Same as the other solution on the zombies. They keep spawning after the waves of other enemies so use them to continue your combo. My record is 301 mill.