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