Here is the full list of all 33 Chicory: A Colorful Tale achievements.
Collect all clothing items
Collect all decor
Pick up all litter
Discover all Brush Styles
Reveal 100% of the map
Complete all art classes
Fill in Gelato's photo gallery
Solve all of Oats' outfit riddles
Delivered all of Artichoke's mail
Deliver mail for Artichoke
Destroyed the Brush.
Grew a brush
Shook Chicory's hand
Find all lost kids
Collect 50% of decor
Solve the mystery of stolen furniture
Sang with Chicory
Pick up 50% of litter
Collect 50% of clothing items
Painted your wielder self-portrait
Collect 25% of decor
Planted the Brushflowers
Discover 50% of Brush Styles
Started the Wielder Trials
Reveal 50% of the map
Pick up 25% of litter
Met Queen Drosera
Collect 25% of clothing items
Chicory painted you
Had a conversation with Chicory on the phone!
Return Beans' kids to her
Met Chicory!
Pick up Chicory's brush