When the game loads up and brings you to a menu scrow across to XBOX LIVE then HEAD TO HEAD SEASONS
from here it will say what division you are in,games remaining,overall record, etc
You should see a bar table in the middle of the screen with a red line and a green line with pts on top like 6 PTS.
The red line is for relegations.
The green line is for promotions
All you have to do is get the required points to get promoted i.e. 12 PTS
You DON'T have to play 10 games to get this if your good.
You can just get the required points to get promoted and you will get the achievement.
Simples
any questions leave a comment below and i'll get back to you ASAP.
Thanks for reading