BOMBERMAN ActZero

Your battle score goes up after each battle you finish. Of course, winning gives you more points. The fastest way is to boost it with your 100 consecutive kills in Battle Royal. For every consecutive win you earn, your score gives you additional points. By the time you reach 100 kills using the above method, you will be very close to getting this achievement. I still had to play a few more games to get this achievement, but I was only 100K off.

*This method is for 4 or more players. Every consecutive match you win raises the score you get each time. Getting lots of kills seem to help too. You do not want to lose one game though so one guy should go for 1 mil before the next guy starts. Also, this game takes forever before it saves. So if you die, eject, dashboard or turn your box off. I did this a few times and I was the host when I did it. I dont think this game saves until you leave the lobby it puts you in after the game is over. I was running 8 of my xboxes by myself. I was trying different thing and when I got this cheev I had 165 kills and had not hosted 100 ranked lobbies yet. I was getting like 34,000 xp a match when this popped.
*My method is once you start to get some decent points , wins and kills, have everyone blow themselves up but you. This will end the match in like 8 seconds, too bad loading takes forever. The drawback is your not getting kills. But here is the good news. If you can even get some people to help you get up to 50 kills before you start this you will be getting a lot of xp when the other guys kill them selves. You should be boosting and must not lose any matches to get the xp rising. I checked later and played against one box and was still getting the 34,000xp per match. This method might sound stupid but when you are playing the game against 7 guys that arent moving things are a little different. There was almost always 2 guys I couldnt kill in the first 2 mins then the blocks start dropping on thier head. Obviously go for the middle 4 guys first as they have way less blocks between them. I would even kill the 4 in the middle then have the out 3 or 4 kill themselves. A lot more blocks in the way on the outer guys.