Here is the full list of all 30 Haven achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Choose not to sever the flow bridge
Finish the game with 3 KO or less.
Try on the flower boots
Choose to sever the flow bridge
Finish repairing the Nest
Become a bird perch
Taste every dish
Lure in Birble with creamberry fondue
Lose a game of strip-a-bobble
Fill the vegetable patch
Beat the Beruberu
Clean up the rust on every fragment
Getting handsy under the waterfalls
Play a guitar ditty
Take a spill each, back-to-back
Reach the maximum relationship level
Midnight skinny dip
Beat the Lorudo
Launch a max-power assistance
Beat the Heliga
Launch a max-power double-attack
Reach the heights
Taste the hygrocybe rubescens
Block attacks until exhaustion
Pacify five critters in one swoop
Hit 5 critters in their weak spot, in one swoop
Give a healing hug
Hold each others' hands and never let go
Land a double backflip
Watch helplessly as the Nest falls