I'd be up for it if you still are!
hey yes sure I'm still up for it. My username is: belieber006, if you're a member you can send me a jam-a-gram when you're online, otherwise just here.
I also tried myself and I got to level 40 so with 2 it should be easier :)
and I'm such a noob, apparently it counts up all the multiplayer games, so in total now I have 31/50 but I didn't do 31 levels with one person.
Update: I got the achievements after playing a few multiplayer games, but I can still play the game with you for your achievement.