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