The hidden achievements of Genshin Impact Puzzle Sea can be unlocked like this

1. Go to the upper left corner of Qinglai Island

First, we need to go to the upper left corner of Qinglai Island and find a stone slab. The location of this stone slab is relatively hidden and requires certain skills to find it. After solving the puzzle on Tablet 1, we can get a key item.

2. Go to the lower right side of Yueshi Village

Next, we need to go to the lower right side of Yueshi Village and find the second stone slab. Likewise, the position of Stone Table 2 is relatively secretive and requires patience to find. After solving the puzzle of Tablet Two, we can move on.

3. Go to the location where the water of Tianyun Pass is decrypted

Then, we need to go to the location where the water of Tianyun Pass is decrypted and find Stone Table 3. The third location of this stone slab is more obvious, but you also need to solve the puzzle to pass it. After solving the puzzle of Tablet Three, we can get the second key item.

4. Finally, we arrived at the left side of Pinghai Village on Qinglai Island.

Finally, we came to the left side of Pinghai Village on Qinglai Island and found the fourth stone slab. The location of the fourth stone slab is relatively obvious, but you also need to solve the puzzle to pass it. After solving the puzzle of Stone Table 4, you can unlock the hidden achievement [Puzzle Sea Area].

The above is the guide to the hidden achievements in the puzzle sea area in Genshin Impact. I hope it can bring some help to the friends in front of the screen. Complete hidden achievements to get generous rewards, making the game experience more colorful.