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