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