Best in Class You must be on top of your team with the most amount of points.
What I recommend doing immediately to get this achievement, while in the campaign if you play Domination where you have to capture points, just sit at a point and defend it, if you die, find another point to hold, you get amazing points for killing enemies, and 75 points every little once and a while for holding the point. I sat guarding multiple spots for an entire map and was over 2000 in defense points, easily #1 on the team.
Good luck and have fun!
Note for the new update(3/24/14): Last night I played a few games and this method no long works to get MVP. I am Extremely sad and Extremely mad as I felt it was an amazing method for MVP's and EXP. So now I must come up with a new method. If anyone finds one or figures it out just message me or comment, otherwise I am going to try new things in game modes to find the best way possible to get MVP's. I can promise you I will try my best and update this solution best as possible because I loved this solution and cannot let it go, I must help the community to getting this achievement, or MVP's for the Pilot Generation requirement (50 MVP's in a generation) I still have to do that.
BEST METHOD SO FAR IN HARDPOINT DOMINATION (For the new update):
After playing new matches in this game-mode the way to get MVP is no longer defending objectives, the best way now is to capture enemy objectives to the best of your ability. When you come to an enemy objective and its a room, make sure to flush the room out by throwing grenades into it, if its an open ground objective instead of a building, I recommend using your titan, unless you absolutely don't like using Titans.
Note: If your team owns all the points, make sure to just guard an objective, that is the best you can do, get those 25 points (
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I will continue to look for a easier way to get MVP's.