Here is the full list of all 19 Haven Park achievements.
Finish all the quests
Find and open 20 crates!
Light 5 firefly lanterns
Swim to the north-most part of the sea
Spend a week in the park
Play the guitar
Jump on a swing
Find and fly with the hot air balloon!
Unlock all skills
Reach level 10
Use the cannon in Old Castle and become rocketman!
Build a ferris wheel in one of the camps
Pew 200 times
Trade resources at a marketplace
Repair 50% of all broken things in the park
Climb the bow of the shipwreck
Find Dr. Wolf's practice
Finish the campers' wishlist in one camp
Collect coins from a food vendor