Ultimate Chicken Horse

This is a cumulative total across all game modes, and even counts wall jumping done in the pregame lobby area. By the time you finish everything else, if you were doing it solo you'll likely be nowhere near done with this (I was around 40% done). Thankfully grinding this out is surprisingly quick. I just went underground on the right side, highest wall with a ceiling, and wall jumped over and over. Don't hold while doing this. That makes you jump farther away from the wall, slowing down how fast you can jump. Just hold right and rhythmically tap and you should have this achievement in around 10 minutes or so, depending how much progress you already made.