Complete the task or action and then you will unlock the reward shown.

Clothing store - Crowd Control level 3 in Suburbs.
Clothing store (more) - Crowd Control level 6 in Suburbs.
Crib customization - Mayhem level 3 in Red Light District.
Crib customization (more) - Mayhem level 6 in Red Light District.
Food and Liquor store - Septic Avenger level 3 in Red Light District.
Food and Liquor store (more) - Septic Avenger level 6 in Red Light District.
Mechanic - Demo Derby level 3.
Mechanic (even more) - All Chop Shop lists.
Mechanic (more) - Demo Derby level 6.
Scratch That music store (free) - Collect all 50 CDs.
Weapon store - Heli Assault level 3 in Trailer Park.
Weapon store (more) - Heli Assault level 6 in Trailer Park.