Here is the full list of all 13 Seaside Driving achievements.
Driving a total of 100 miles
Buy Betner car
Buy Campol car
Buy Supromo car
Buy Finetto GT car
Buy Rhino car
Buy Pond 7 car
Buy Sobre S car
Buy Parkler car
Buy Greenroads track
Buy Alpine Breeze track
Buy Tall Trees track
Buy Retrozone track