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