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