Distract opponent:
Begin a game with two or more players. While the other person is hitting the ball, push A button to say things to distract them.

Atlas Driver:
Finish the Stroke Me event.

Atlas Fairway Woods:
Finish the Not-So-Goodfellas event.

Atlas Irons:
Finish the High Rollers event.

Atlas Putter (Black):
Finish the All The Marbles event.

Atlas Putter Gold:
Finish the Suave's Revenge event.

Atlas Wedge:
Finish the Pretty In Pink event.

Boiler Maker Fairway Woods:
Finish the Hole Lotta Luv event.

Boiler Maker Irons:
Finish the Jersey Ball Bash event.

Boiler Maker Putter:
Finish the Sun Stroke event.

Boiler Maker Wedge:
Finish the Back 9 Shuffle event.

C.C.:
Finish the Hot, Hot, Hot event.

Cincinnati Balls:
Finish the Rough Riders event.

Cincinnati Driver:
Finish the Ol' Blood and Guts event.

Cincinnati Fairway Woods:
Finish the Full Frontal event.

Cincinnati Irons:
Finish the Stroke Me Again event.

Cincinnati Wedge:
Finish the Blister In the Sun event.

Coiler Maker Driver:
Finish the Money Talks event.

Doc Diggler:
Finish the Ladies Night event.

Ecstasy Balls:
Finish the Scorched Earth Classic event.

Ecstasy Putter:
Finish the Motley Crew event.

Killer Miller:
Finish the Test Drive event.

Nelson Balls:
Finish the Different Strokes event.

Python Driver:
Finish the Heat Rash Invitational event.

Python Fairway Woods:
Finish the Tough Crowd event.

Python Irons:
Finish the A Hole In The Sun event.

Python Wedge:
Finish the Garden State Stroke Fest event.

Scrummy:
Finish the Odd Ball Classic event.

Suave's Balls:
Finish the Garden State Menage a Trois event.

Suki:
Finish the Baked On The Bone event.

Trixie:
Finish the Chicks With Sticks event.

More attributes:
Play in the tour modes. After completing the putting, driving, etc., you will get more attributes.