Here is the full list of all 23 Mr. Pumpkin 2: Kowloon walled city achievements.
Complete "Block Breaker" in the arcade in under 2 minutes
Complete Chapter 4 "South Side"
Use the elixir to rescue the little girl
Give the sheet music to the busker
Fix the dentist's circuit box
Complete Chapter 3 "North Side"
Help fix the clock in the elderly recreation center
Help the distressed woman in the salon with an old flame
Help the old lady sleep
Help the child from the dumpling shop obtain a martial arts guidebook
Complete the tram ride in Chapter 2
Help the arguing couple reconcile with each other
Shut off power to make the baker work
Use the bottles to play a beautiful melody
Touch 20 slabs of meat
Chase away 100 chickens
Complete Chapter 1 "West Side"
Give food to the hungry pregnant woman
Repeatedly open the bathroom door
Complete all games within the arcade
Get the mouse doll on your first attempt
Successfully repair the circuit box
Complete the prologue "Runner"