Tomb Raider Remastered - Meteorite Caverns+, All Hallows Where?

If anyone has a clue how to unlock the bonus stage let me know cause I’ve full secreted the game twice, once on a much harder difficulty and my prize is N O T H I N G! Good game though. In case a dev looks at this and needs as many details as possible: Route: India to Nevada to London to SE Pacifiic to Antarctica All 60 secrets as listed in the final stats screen. Frequently change Save File Position.