You’ll have to hit island targets for high scores. Aim for 3 as often as possible as it is worth the most and grants you extra shots. For the back of the island swing hard, for the middle take an easy, relaxed swing, and for the front perform a light swing. This way you should never hit it over the island, but you ought to manage to hit it before the island if you swing too lightly. Part way through, there'll be wind thrown in. For light winds, line up your shot to the edge of the target and let the wind take it towards the centre. For strong winds you’ll aim quite a bit off target. Take a shot or two to adjust to those heavier winds.
Things get a little tricky around the 40s, just don’t panic and make sure at that point you get enough for the achievement.