Here is the full list of all 52 Wet Sand achievements.
Being a prisoner on the ship, ask Bill all the questions
Disable NSFW content
Complete the Prologue
Spank a girl
Find out Olivia's secret
Beat Anna in shooting without misses
Guess the cards in the game with Olivia
Learn how to sail the ship by proving it to Lauren
Correctly answer all the tavern keeper questions without reading the code
Finish the first chapter with a good relationship with all your crew
Choose chat with Nadia instead of brothel services
Meet Tovenaar
Get to know Anna better
Kiss Olivia
Don't tell the crew that you're not alone on the island
Bring Bill a bag of guano
Find out a little secret
Spend the evening with Aquanite
Follow the Elf
Win for the first time in the "Tailwind"
Make the right choice in the game with Anna
Draw Miss Brown
Meet a cave dweller
Finish the maze in any way
See Benno's beauty
Don't lie once during your time on the island
Pick the same girl during the last night out and who to sleep with on the beach
Learn from Tovenaar about the history of the world
Let Lauren please you
Take advantage of the moment
Find out who poisoned Brand
Stay within a hair's breadth of death
Convince Sorna to spare you
Get a reward for the stuff
Get the maximum amount of money from the merchant
Find Benno and comfort the girl
Save Dolores from death
Defeat Anna in fencing
Touch Dolores' breasts
Complete Benno's quest
Spend the night with Benno
Take over the town for Cathal
Get a thank you from Cathal and Lauren
Complete Olivia's quest
Get a thank you from Olivia
Get to know the other side of the elf girl
Calm Anna
Make a deal with the basement dweller
Help Leephi escape punishment and get a commendation
Give the elf girl an item from the caves
Give the hat to whoever is chosen as the romantic interest on the island
Go to the depths with the Sea Maiden