Here is the full list of all 30 Haven achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Launch a max-power assistance
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
Clean up the rust on every fragment
Beat the Beruberu
Taste the hygrocybe rubescens
Beat the Heliga
Beat the Lorudo
Getting handsy under the waterfalls
Taste every dish
Take a spill each, back-to-back
Launch a max-power double-attack
Lose a game of strip-a-bobble
Play a guitar ditty
Become a bird perch
Lure in Birble with creamberry fondue
Reach the maximum relationship level
Fill the vegetable patch
Midnight skinny dip
Pacify five critters in one swoop
Hit 5 critters in their weak spot, in one swoop
Reach the heights
Land a double backflip
Give a healing hug
Block attacks until exhaustion
Watch helplessly as the Nest falls
Hold each others' hands and never let go