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