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