Edit: The description is wrong... but I don't know what's right.
What I do know is that you don't need all 100 on one hole. I had 6 holes and a total of 249 votes when mine popped. The most that any hole had was 55. So take that as you will.
Edit: Someone today said they had a grand total of 29 votes on a single hole. So you may already have it by the time you read this.
The achievement popped after I had been gone a while and logged into the game, at the Main Menu screen.
Here's the original solution:
Go to Play Solo, then use the
to go to Editor and make your game.
When you want to rate others, back out to the Play Solo menu, then
to Course Browser. From there, finding a particular hole is also a bit difficult...
...so boosting may be the way to go on this one. Sorry to be the bearer of bad news. Welcome to large boosting sessions. As I've said in some other solutions, you can have up to 32 accounts on one console. Even so, you'll need to have 3 other people doing the same.
Beyond boosting, the chances of other people finding your hole are probably low. There isn't any real search functionality (not all of my friends show up under that tab), so again a group might be good since there will be fewer holes to look through. In case you were wondering, it doesn't seem like lots of votes move you up the Top Rated board. However, if a group gets together and makes holes right then (earning you another achievement), they will be high on the Latest board.
I have a feeling that the achievement will be a lot like Project Spark, so if you're look for people to rate your hole, please post in this thread:
Infinite Minigolf - Master Builder boost threadBest of luck (and please rate mine, too)!!