There are 10 garages to buy in all, in 10 different areas of San Francisco. There are garages in these 10 districts:
- Fisherman's Wharf
- Forest Hill
- Golden Gate Park
- Hunters Point
- Lighthouse Bay
You will be rewarded with 'First Time Buyer' when you buy your first and this achievement when you've bought all 10. In total you should roughly have spent around .75 million dollars on garages.
Note: This can only be obtained after unlocking the last section of the city.