Use Amateur difficulty settings and calm weather to make this easier. You do not have to play the whole course to unlock this and can be play on a quick play, custom hole setup with just these 3 holes selected or can be achieved in Tiger Legacy mode. The 11th hole is a par 4, the 12th is a par 3 and the 13th is a par 5. All are fairly easy to birdie with all the settings turned down as low as possible. This will still take a little bit of skill as you will still need to land close to give yourself an easy birdie put on the 11th and 12th. The 13th is very easy to birdie and more than likely most will end up with an eagle on this hole.