noun
1
BAD : My immediate ambition is to find somewhere to live.
GOOD : My immediate aim is to find somewhere to live.
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ambition = something very important that you have wanted to do or achieve for a very long time: 'Sandro's one ambition is to play for Italy in the World Cup.'
aim = what you hope to achieve when you do something: 'The aim of the course is to develop the students' writing skills.'
2
BAD : Not many people manage to satisfy their ambitions.
GOOD : Not many people manage to achieve their ambitions.
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achieve your ambition (NOT satisfy, meet, reach, arrive, etc ): 'He has achieved his main ambition - to make a name for himself in politics.'