Tomb Raider

Achievement: No Stone Left Unturned
Description: All documents, relics, and GPS caches found.

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To earn this, you basically have to collect all extra items that can be found all around the island. If you are going for this achievement, I would recommend taking that extra time to search for the Caches/Documents/Relics while you are playing through the story mode, as it will be less of a hassle to go back and find all of them after you have finished the game. Although it will be much easier overall to do so, after the story mode is completed. I would also recommend that you focus on one area at a time, as well as following guides to find each item faster. Only because I spent a lot of time wondering around while going for this. Use these tips, and follow the video guide, and you should be able to get this achievement before you know it.

Finding all collectibles, will also earn you the following achievements:

Bookworm - 25% of all documents found.
Historian - 75% of all documents found.
Relic Hunter - 25% of all relics collected.
Archaeologist - 75% of all relics collected.
Looking for Trouble - 25% of all GPS caches found.
Bag Full O' Cache - 75% of all GPS caches found.

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Locations of all: