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