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