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