Full list of all 26 Totally Reliable Delivery Service achievements worth 1,015 gamerscore.
The base game contains 25 achievements worth 1,000 Gamerscore, and there is 1 DLC packs containing 1 achievements worth 15 Gamerscore.
Complete first delivery
Complete 10 different deliveries
Complete 50 different deliveries
Complete 100 different deliveries
Change your clothes
Remain airborne for 10 seconds
Find the tiny island
Visit Gasa Research Facility
Visit Keister Island
Visit Happy Clam Resort
Unlock the mule
Unlock the buggy
Unlock the pickup truck
Unlock the helicopter
Unlock the rocket booster
Pass gas in a biplane
Put treasure chest on sloop
Bring the luchador mask to wrestling ring
Bring the conch shell to top of mountain
Return the satellite to GASA
Bring banana to room 5 at Banana Motel
Bring grill to Dad Statue in Golden Ruins.
Bring foam hand to Booster Club Arena
Lose pants in tornado at Happy Clam Resort
Complete all other achievements
Find the big secret bear.