This one is easy and doesn't really need a guide. But here's one anyway.
If you're having trouble finding a public match, Then the hardest part about this will be finding a friend to do this with.
If you have found a friend on the same platform turn off crossplay and then start a Team Multiplayer lobby.
Have your new, or old friend join.
Once you're both ready you will now start a 20-minute 1v1 team match. You can play hard out to see who is the best or just run around for a bit.
If you figure out how to change the settings post below. They were locked for me.
Win or lose you'll both get the achievement.
You can also do this if you have a second account and second console.