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