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