Easy, go to the neighbourhood before you load your family and get up the cheat bar (CTRL+SHIFT+C). Then enter boolprop testingcheatsenabled true in the cheat bar and press enter, now load your family and hold shift and click on the sim you want (click on them while your still holding shift) then find the option "set aspiration level" (let go of shift now.) Now click on set aspiration level and find the one you want E.G "Family" or "Romance" or "Knowledge" or "growing up" and click on it, now the thing your sims aspire to has changed. Good luck
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Yes, all you need to do it type in the boolprop cheat, then shiftclick on your Sims, then click "set aspiration..." there are 2. You can change their apiration all-together or you can make it lower or Platinum ect...
Here is a cheat for full aspiration in The Sims 2. Type ctrl+shift+c and in the dialog box type maxmotives.
They are rewards for how high your aspiration meter is and so you can enjoy things out of it. Enjoy
To get aspiration points you just for fill the sims wants (green pictures on the panel) and don't let their fears be for filled (red picture's).
7,000 aspiration points