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