An Albatross is 3 shots under par, so you want to get a score of -3.
The easiest course to get this on is Britannia Hole one.
You can easily get an Albatross on this course so get yourself to green as fast as possible and make sure that you sink the ball on your first shot.
Here's a video of an Albatross. (Note this will not also unlock the Birdie and Eagle trophies)