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You can use a treasure compass to help find treasures found in Liyue region. This is obtainable by reaching level 6 for your city's reputation. When you use it, there will be a guiding light that lasts for 1 or 2 seconds, pointing towards the direction of a nearby treasure, it will then enter a 30 seconds cooldown. If there are no treasures nearby, then it will only be on cooldown for about 5 seconds.
Treasure compass won't show chests that are hidden. The ones that shows up when you do the balloons, or through any hidden mechanic won't be shown by the compass.
Liyue treasure chest compass is from Liyue city reputation, while Mondstadt treasure compass is from Mondstadt city reputation. Tap the treasure chest icon to pick up the rewards. Once you get the blueprint, go to your inventory to "use" the blueprint, then craft it by going to the blacksmith.
To the east of Stone Gate, on the exclamation marker shown in the picture above, you will find a small cave with some hilichurls inside. Clear them out and 3 treasure chests will appear.
North of Statue of the Seven - Geo
North of the Statue of the Seven - Geo in Stone Gate, there is a chest that is quite hidden in a box. Destroy the box to reveal it.
From the Wangshu Inn teleport waypoint, you can jump out the balcony and glide into the area next to the watermill. Go inside from under the area, and you will find a Cryo pillar that will give you a treasure chest when activated.
North east of Wangshu Inn, on a small separate island, you can find many small lion statues facing different directions. There is 1 empty spot in the circle of statues, fill it up with Geo main character's elemental skill and a treasure chest will appear.
Go to the top balcony in Wangshu Inn, and interact with the rockery basin there to get some dialogue.
Then go to the marked location in the mountain area that's just above Liyue Harbor.
You can start by going north from the closest teleport waypoint, then climb up from this location. You don't have to climb all the way up the mountain, but it is still quite a distance.
Near the middle of the two mountains, you will find a small area with a shovel. Interact with it and you will get a treasure.
North of Wangshu Inn, past the bridge, you can see some umbrellas near a tree. Walk around the tree and umbrellas and some slimes will show up. Defeat all of them and a hidden chest will appear.
Near the Water Wheel
When you teleport to Wangshu Inn, turn to the right, and jump off the fence and glide slowly. You can see a treasure chest shown in the picture above, as well as a treasure chest with some vines that you can see to the right of the picture.
To the left of Wangshun Inn and Dihua Marsh, there is a teleport waypoint with a lion statue.
Use Geo main character's elemental skill on the head of the lion statue, and a hidden chest will be revealed just below it.
In front of the cave entrance to the mines, there is a noticeably big rock. Behind it is a place that you can dig to get a treasure.
Guyun Stone Forest
On the small island next to the teleport waypoint in Guyun Stone Forest, go to the marked location shown in the picture above, and you will find a boat on top of some rocks. Climb up to the top of the boat and destroy the rocks there to reveal a chest.
Crevice near domain
Near the domain door in Guyun Stone Forest, you to the spot shown above, and turn to the right to go inside a small crevice to find an easily missed treasure.
Near sleeping hilichurl
North east of the domain area, there is a hut with a sleeping hilichurl. Burn the wooden pikes in the hut, then clear the enemies and a hidden chest will appear.
Outside of the Ruins in Dunyu Ruins, shown on the marker above, you can stand on top of the dead branch and a hidden chest will appear.
There are 2 unlit pillars in Yaoguang Shoal that's somewhat hidden because it's underwater.
The one on the right, needs Hydro element. You can get closer to the pillar by using Geo element main character, then use charge attack with Barbara to activate it.
The one on the left requires fire, so you can use either Amber, or Xiangling's elemental skill to light it up.
It is absolutely accessible! Just takes like an hour of climbing into a tiny hole until you finally glitch the game out enough to get in. The chest is very much still there. If you need a more detailed explanation of how to get in I'd look it up cause i dont have any pictures to show you unfortunately