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