(I use machine translation)

The collection of ancient tablets, which also affects the achievements, is instructed to borrow the abilities of the Poilu, but in fact most of them can be found on the area and obtained directly.

If you bring Poilu to a specific location and wait, he will randomly dig out the corresponding tablet, but the exact conditions under which he will begin his search are unknown.

So, for those who want to complete quickly, here is a map of where the tablets are located.

←The position and direction of this mark indicates the location of the tablets.

Here is a screenshot of the actual scene where the tablet was found.

One of these tablets required Poilu's help to find. (In my case, unearthed near my grandfather's house)
If you find the exact location of this, please provide a screenshot!🙏

The remaining one is to the north of behind Grandpa's house. Face northwest.
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(1/3) East of he Mountain path,facing southeast.
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(2/3) South of the Mountain path,facing south.
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(3/3) The Mountain panorama,behind the tree.
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(1/2) Northwest of the Plantation terraces,facing west.
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(2/2) Southeast of the Vanilla plantation,facing south.
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(1/3) Jungle entrance, facing southwest.
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(2/3) Junction of upper jungle and lower jungle.
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(3/3) East of the upper jungle,facing south.
*Supplementary* The above two locations are very close to each other.