i know i said no tombs but i said all tombs no all tombs you atleast need to get one tomb to get the mortor gun

to find tombs go to a ? mark on your map

when you find a tomb hit e on its door and go behind the tomb and there should be a mortor

if yo dont hit e on the tomb there will be no mortor behing it as seen in this screen shot https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1566351783


if you do hit e you will see the mortor behind it in this screen shot https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1566351715

some tombs have the motor away from the tomb but its still behind it like in this screen shot

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1566351976


but how to know you completed the tomb? there should be a flag next to the tomb as seen in this screenshot

https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1566351866

i hoped this helped you