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The Lost Temple is accessed by a portal below a group of rocks about halfway through the game. It is a series of infinite rooms which has 3 reachable areas, which can be accessed by following a certain pattern.

One area can be accessed by following the “You are not alone” guide.

Once you’ve unlocked the “Dark waters” achievement you will find a compass in the middle of the mysterious island. This will show what directions different symbols represent: Moon=Up, Sun=Down, Constellation=Left, Arrow like symbol=Right.

The order in which to follow these symbols are found in two places: 1) On a carving in certain areas of the lost temple 2) The symbols which appear after pressing next to the totem in the room with the portal, after collecting all secret objects (a guide for which can be found under the “Another lead” achievement).

Head through the portal to the lost temple and follow these directions to reach the areas which contain the compass, and an artefact.