Here is the full list of all 19 Chef Chen achievements.
Stage 1-1 gets 3 stars
Stage 1-2 gets 3 stars
Stage 1-3 gets 3 stars
Stage 2-1 gets 3 stars
Stage 2-2 gets 3 stars
Stage 2-3 gets 3 stars
Accelerate the heated food 20 times
Use shield to cut ingredients 10 times
Portal forward 30 times
Open the portal 10 times
2 Seconds Gliding 10 times
Use Whirlwind to get food 10 times
4 players complete 20 levels together
Complete 300 dishes
Complete 10 dishes