To unlock players, you have to get the indicated number of points:
Al Kaline: 2500
Babe Ruth: 5000
Billy Williams: 2500
Bob Feller: 3500
Bob Gibson: 4500
Bob Lemon: 3000
Brooks Robinson: 3500
Catfish Hunter: 3000
Cy Young: 4500
Early Wynn: 3500
Eddie Mathews: 4000
Ferguson Jenkins: 2500
Gaylord Perry: 3500
Hal Newhouser: 2500
Harmon Killebrew: 3500
Honus Wagner: 4500
Hoyt Wilhelm: 3000
Jackie Robinson: 5000
Jim Palmer: 4000
Jimmie Foxx: 4000
Joe Morgan: 4000
Juan Marichal: 3500
Larry Doby: 3000
Lou Brock: 3000
Lou Gehrig: 4500
Luis Apraricio: 3000
Mel Ott: 3500
Mike Schmidt: 4000
Nolan Ryan: 4500
Orlando Cepeda: 3500
Pee Wee Reese: 3500
Phil Niekro: 2500
Phil Rizzuto: 3000
Ralph Kiner: 2500
Reggie Jackson: 4500
Richie Ashburn: 2500
Robin Roberts: 2500
Robin Yount: 4000
Rod Carew: 3500
Rollie Fingers: 3500
Roy Campanella: 4500
Satchel Paige: 4500
Sparky Anderson: 4500
Tom Seaver: 4000
Tommy Lasorda: 4500
Ty Cobb: 5000
Walter Johnson: 4500
Warren Spahn: 4000
Whitey Ford: 3500
Willie McCovey: 4500
Willie Stargell: 4000
Yogi Berra: 4500