Unlock Dead clubs
Play a poor round (18 holes) in tour mode with a bad score (above +5) and make lots of poor shots.
Unlock Blessed clubs
Score lots of birdies (or better) with the dead clubs in tour mode. Dead clubs will turn into blessed clubs at level 10.
Play as Mack
Select survival mode. Win forty consecutive matches to unlock Mack.
Just A Little More ball
Select survival mode. Get 100 consecutive wins to unlock the Just A Little More ball.