Originally Posted by: One Refort 
If it helps anyone at all, I just got the achievement in a full ABC'S lobby. I started last place in S class and finished first overall. Wasn't really expecting it, just happened.
I had wondered whether this would work or not, thanks for clearing it up for me.
I play a lot of ABCs, and have yet to start last in a full lobby, so even though I win the majority of races I haven't had the chance to get this achievement yet.