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