Taken from here
Timmy and Tommy's Store
Basic: 8am to 10pm
Beginning
Convenience: 7am to 12am
*Seven days since the first community project completion
*Spend 12,000 bells of bought 15 items from the store
Supermarket: 9am to 8pm
*Have convenience AND gardening store for 10 days
* Spend 25,000 bells at the convenience store
Home Center: 10am to 11pm
*Spend more than 50,000 bells at the Super Market
* 21 days since the supermarket opening
Department Store: 9am to 9pm
*Spend 100,000 bells at the Home Center
*30 days since the Home Center opening
Shoe Shank (Pretty sure it's Shack, not Shank)
10 days after becoming mayor, and spend 8,000 bells in the Able Sisters' shop
Takes 3 days to built
Club 444/101
You need Dr. Shrunk to visit. To do so, try the following
* 13 days pass since first moving to town
* 10 days pass since the first community project
* Have the convenience store be built. Shrunk will want you to get your neighbors to sign a form.
Six days for it to open
I'm confused about 1 thing. When do you unlock the gardening store? Is it immediately unlocked or is it unlocked with the convenience store?