As cool as it is getting an high achievement very easily by getting supporter and finding a U or X player that carries you to the top, they should be separate so people have to earn it by themselves.
Also, unlocking floors and mods in duo should also be removed, since it again makes it too easy.
What would be cool is having separate Mods specifically for Duo that you can unlock together.
TLDR: Separate Duo and Single QP achievements, scores and mods so nobody gets carried
for tagging along with your
friend
is crazy