There is a set of five All-Decade Teams (1950's through 1990's), and all of the players on those teams can be unlocked to become available to put on any desired roster. In order to achieve that for each player, the game will give you hints as to how this may be done. Michael Jordan, for instance (as well as for Wilt Chamberlain and one other player from the 1950's team), can be unlocked by beating Michael Jordan with any player in the superstar level in the game's one-on-one mode. If there is a way to unlock players by achieving certain performances in a single game, the easiest way to do that is to use a great team (like the All-Decade Teams) against a poor one (like the Chicago Bulls). For seasonal achievements, just work your way through it. All the achievements can be achieved, but if you want to win by a lot over a team, do not try to make 15 'threes' or pick up 30 assists in a game -- just play up-tempo basketball. If you try to make the achievements, watch yourself because you also have to win the game to unlock the legends.