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