This can be done in casual games straight from the main menu. Doesn’t even have to be the online customs. Simply go to custom game, choose whatever game mode you want (I’ve been doing 2v2 just to have a teammate) and set the ring out to 1 and time to 2 mins. Keep doing this and you’ll eventually obtain this achievement. Also set your bot teammate on hard difficulty while the enemies on very easy just to make this a lil easier
Alternatively, if you have multiple systems, you can do a Party Match where you boot up another console like a Xbox or PlayStation, set the ring out to 1, select the Teen Titans Tower stage, have the alternate account jump off the stage and get yourself a free win, keep doing this until you get the achievement, otherwise, you will have to ask people for help for getting this
If anyone wants help with this, make sure to message me and i'll try to help