Here is the full list of all 23 Mr. Pumpkin 2: Kowloon walled city achievements.
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 child from the dumpling shop obtain a martial arts guidebook
Help the old lady sleep
Complete the tram ride in Chapter 2
Use the bottles to play a beautiful melody
Help the arguing couple reconcile with each other
Shut off power to make the baker work
Touch 20 slabs of meat
Chase away 100 chickens
Complete Chapter 1 "West Side"
Give food to the hungry pregnant woman
Complete all games within the arcade
Complete "Block Breaker" in the arcade in under 2 minutes
Get the mouse doll on your first attempt
Successfully repair the circuit box
Repeatedly open the bathroom door
Complete the prologue "Runner"