Unlock the mule.
Unlock the buggy.
Pass gas in a biplane.
Complete 50 different deliveries.
Complete first delivery.
Remain airborne for 10 seconds.
Unlock the helicopter.
Visit Gasa Research Facility.
Visit Keister Island.
Complete 10 different deliveries.
Unlock the rocket booster.
Find the tiny island.
Visit Happy Clam Resort.
Complete 100 different deliveries.
Change your clothes.
Unlock the pickup truck.