To record achievement popups using OBS, make sure you check the box for "Capture third-party overlays" when adding your Game Capture.

How to remove Overboard! 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 following commands one by one (sadly no batch support seems readily available)

achievement_clear 1546920 A_GoneToPrison

achievement_clear 1546920 A_EscapedPrison

achievement_clear 1546920 A_EscapeWithin3Hours

achievement_clear 1546920 A_EscapeWithin5Hours

achievement_clear 1546920 A_MadeSomeMoney

achievement_clear 1546920 A_FullHouseIn5Hours

achievement_clear 1546920 A_FullHouseIn2Hours

achievement_clear 1546920 A_NoLooseEnds

achievement_clear 1546920 A_NoLooseEndsIn5Hours

achievement_clear 1546920 A_NoLooseEndsIn4Hours

achievement_clear 1546920 A_ReunitedWithMalcolm

achievement_clear 1546920 A_GotYourMan

achievement_clear 1546920 A_TalkedSomeoneDown

achievement_clear 1546920 A_GodCriticisedPoetry

achievement_clear 1546920 A_SteerTheShip

achievement_clear 1546920 A_Liason

achievement_clear 1546920 A_DruggedAnOldLady

achievement_clear 1546920 A_Blackmail

achievement_clear 1546920 A_WinAtCards

achievement_clear 1546920 A_AllMalcsStuffOverboard

achievement_clear 1546920 A_DoubleHomicide

achievement_clear 1546920 A_TripleHomicide

achievement_clear 1546920 A_QuadrupleHomicide

achievement_clear 1546920 A_QuintupleHomicide

achievement_clear 1546920 A_HextupleHomicide

achievement_clear 1546920 A_SeptupleHomicide