Here is the full list of all 36 Bilkins' Folly achievements.
pat all the animals
Cause a seagull to crash into the camera
find 64 pieces of junk
Collect every last piece of booty
find every gold nugget
catch every fish
collect every piece of gear
find all the quest items, gold nuggets, pearls, booty, diary pages, junk and fish... phew!
Share an informative meal with the crew
Make amends with the boss of Remy's Lott
Fully upgrade your ship
Find your first piece of junk
8 pieces of junk
32 pieces of junk
Collect 5 pieces of booty
Collect 20 pieces of booty
Mine a gold nugget
Snag a fish
Unlock the ship
Reach Crabb Island
Reach Phelmy Island
Reach Remy's Lott
Reach Leeky Harbor
Reach Shattered Peak
Collect La Moina's key
Beat the minecart puzzle
Beat the bats dungeon
Have a conversation with Rosemary
Have a conversation with Winston
Fame or family - make a choice
Decide Philmore's fate
Come to a resolution with Gail
Solve all of Carlos' songs
burgle every home in Leeky Harbor
beat the game without ever turning on normal mode
Find a secret in Drayton's dream world