Ultimate Chicken Horse

First of all, you'll need at least 3 players in your game to get a solo point. You can either get this by playing online and being good at the game which is actually easier than it sounds because most people online aren't exactly the greatest players in the world. Or you can play by yourself on the shared controller couch and just add 3 or 4 people. For a solo point you just need to be the only person to finish a single round.

You need at least 3 controllers if you want to grind this achievement.

Map: Pier (This way the other two players die automatically)
Under Modifiers have jetpacks on
Points to win: 20
Placement timer: 5 sec
Turn the amount of rounds to off
Set the 'goal' and 'score' points to the minimum.
Have your profile's character get 10% of the points.

Now you just have to fly with the jetpack to the goal 100 times.