Here is the full list of all 33 Chill Town achievements.
Acquire or craft at least 100 different decorations
Complete building your own house
Dig up all artifacts
Finish constructing Ella's house
Complete the garden quest
Cook 10 different dishes
Find all types of crops
Find any type of crop
Discover any type of flower
Find all types of flowers
Gift all NPCs at least once
Decorate homes for at least 5 NPCs
Find at least 5 explorers on desert island
Catch at least 30 different fish species
Catch at least 100 fish
Catch at least 20 different creatures or insects
Catch 100 creatures or insects
Craft all Tools
Plant at least 80 flowers
Plant at least 120 crops
Chat with any NPC in the café
Catch at least 10 different Pals
Have at least 15 Pals at the Pal Centre
Successfully create a Hybrid Pal at least once
Successfully create Hybrids at least 10 times
Decorate your house with at least 20 decorations
Catch the Mystical Fish
Unlock 10 cooking recipes
Complete 20 perfect crops
Find 10 bottle letters on beaches
Find 50 chests
Upgrade your house to the maximum
Upgrade your house to a larger siz