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