This one is pretty simple. You need to play a full 18 hole CLASSIC 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: OASIS"
* Choose "MODE: CLASSIC" (do not customise or it will void the achievement)
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.