Here is the full list of all 18 Havendock achievements.
Have a settler with a Level 15 trait
Equip a settler with a Moon Bunny Costume
Use a Dynamite
Turn into a Chick
Build 500 structures on decks
Make the final construction and finish the game.
Use a Clone Potion Lv3
Have 50 bots
Upgrade a settler’s trait to level 5
Reach 100% friendship on 6 traders
Steal and sell Cattleman Josh’s shirt back to him
Completed 80 researches
Have 50 settlers
Ride the mother kewi
Own a talking penguin
Visit Bird Island
Get a golden retriever
Catch a salmon with a Fishing Rod