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