This one is pretty simple. You need to play a full 18 hole CUSTOM game for this to unlock.
Your performance doesn't matter, so you can play as you like, but there is a quick way to get this achievement.
* Choose OFFLINE from the main menu (means there's no waiting for others to take shots)
* Choose "COURSE: ANY" (I chose twilight)
* Highlight MODE, and press
to bring up the game settings.
on any mode on the left (I chose Classic), then modify the settings on the right. (any settings, just make them different to default)
to apply these changes. You can tell your game is custom because the mode will say "Classic (Custom)", or whatever type you chose.
* Then press
to start the game
* When ready to take your first shot, press
and choose "FORFEIT HOLE" (this will instantly end the hole)
* Repeat for all 18 holes
Should take 5 minutes for this achievement this way.
NOTE: on the main menu, there is an
"customise" option. This is custom ball settings, not the custom match settings needed for this achievement.