You need 5,975,100 total EXP to reach level 100. You can check your EXP total by hitting
on your gamer picture at the top left of the main menu and checking your score stat (since score = EXP.)
Beyond playing legit, which is a foregone conclusion if you're looking up a solution for this achievement, there are two methods to boost this effectively. Both of them require changing your region to Asia by opening Settings, then EA Account.
The first method is the most popular: droid run. Using 4 or 6 people, everyone pairs up with someone on the opposing side at an objective. Simply follow the gonk droid around and hold
. You get about 6,250 EXP per minute this way but you cannot stand still for longer than about 3 seconds before the droid walks out of capturing range, so it's a very involved method. Droid run matches also must absolutely end after 10 minutes so you will be doing a lot of loading between matches.
The second way is drop zone. You can only use 4 people for this mode but the method is the same; find an objective and hold
. The benefit of drop zone is that the objectives do not move so you can just set something heavy on your
button and watch Netflix, but the drawback is that you earn 4,550 EXP per minute. Fortunately, matches do not end in drop zone as long as the score is tied so you can avoid a lot of loading time.
When in drop zone, you will begin with a single capture zone. Ideally you want to switch around the people who get this first pod in the interest of fairness. After 3 minutes, a second drop pod will land. Now everyone can boost at the same time.
The only gotchas about drop zone:1) wireless controllers are a hazard because they will shut off despite having a button held down, since it probably assumes this constant input is accidental (e.g. having dropped your controller upside down on the floor.) If your controller is wireless, keep it within reach and either taunt or check the scoreboard once in a while. Neither interrupts your
button.
2) the servers do not seem to be designed to stay continuously functioning for longer than about 30 minutes, so at some point the match is simply going to crash out and all the work you did will be lost. Ergo, you want to let one team take both pods when everyone's gotten 150k EXP or so. Going beyond 200k is dangerous, and you'll never reach 250k before the servers go out.