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