THE SIMS 2 UNLOCKABLES
Alien Crash Site
You must help XY-XY. To do this, just keep fulfilling his aspirations and make him friends with Jonas. This will unlock The Bio-Dome.
Business career
To master the Business career you must have Body at level 9, Logic skill at level 9, and Charisma skill at level 7.
Business career bonuses
When you get to level 6 in a job you can ride in a limo. You will get to fly in an helicopter at about level 9.