Here is the full list of all 25 Totally Reliable Delivery Service achievements.
Complete 100 different deliveries.
Find the tiny island.
Unlock the pickup truck.
Unlock the rocket booster.
Bring the luchador mask to wrestling ring.
Return the satellite to GASA.
Bring banana to room 5 at Banana Motel.
Bring grill to Dad Statue in Golden Ruins.
Lose pants in tornado at Happy Clam Resort.
Complete 50 different deliveries.
Unlock the helicopter.
Pass gas in a biplane.
Put treasure chest on sloop.
Bring the conch shell to top of mountain.
Bring foam hand to Booster Club Arena.
Find the big secret bear.
Visit Gasa Research Facility.
Visit Keister Island.
Visit Happy Clam Resort.
Unlock the mule.
Unlock the buggy.
Change your clothes.
Remain airborne for 10 seconds.
Complete first delivery.
Complete 10 different deliveries.