How to remove When the Past Was Around achievements from Steam on Windows

• Launch run (WIN+R)
• Type the following and press enter: steam://open/console
• In Steam Console that opens, type in the achievement_clear commands below one by one (sadly no batch support seems readily available)
• For some achievements like Open All Windows and Break All Pots, achievement_clear isn't enough, so you will also need to delete your local save file - present at %APPDATA%\LocalLow\Mojiken Studio (%APPDATA% is typicall C:\Users<username>)

achievement_clear 1164050 ACH_BreakPot

achievement_clear 1164050 ACH_Photo

achievement_clear 1164050 ACH_PianoAlt

achievement_clear 1164050 ACH_Tombstone

achievement_clear 1164050 ACH_Curtain

achievement_clear 1164050 ACH_TidyRoom

achievement_clear 1164050 ACH_PostboxBird

achievement_clear 1164050 ACH_IceCream

achievement_clear 1164050 ACH_Biscuit

achievement_clear 1164050 ACH_Radio

achievement_clear 1164050 ACH_SafePass

achievement_clear 1164050 ACH_CreditMelody

achievement_clear 1164050 ACH_Window

achievement_clear 1164050 ACH_Final

achievement_clear 1164050 ACH_PrologueComplete

achievement_clear 1164050 ACH_Ch1Complete

achievement_clear 1164050 ACH_Ch2Complete

achievement_clear 1164050 ACH_Ch3Complete

achievement_clear 1164050 ACH_Ch4Complete

achievement_clear 1164050 ACH_Ch5Complete