Easy 'Master Putter' Achievement
Whenever you click it is registered as a shot (even if the ball does not move). Just repeatedly click until you reach the required amount of clicks to unlock the 'Master Putter' Achievement.
Easy 'Nice Shot!' Achievement
When you reach Hole 14 on Forest aim a few pixels to the left of the bullseye on the right-most target and drive the ball at full power. If done correctly the ball will land next to the wall opposite the hole. From there if you aim your putt directly at the hole with your strength meter at about 75% of the way to the first mark you should be able to get an albatross.
Glowing Golf Ball
Many have discovered that on the "Oasis" map, your ball will glow once you go inside the pyramid. What people may not know is that you can easily enable/disable this feature anytime you want! Simply press the "L" key on your keyboard.