In this article, we're returning to the meticulous collection of hidden achievements in Fountain, added in 4.0. Here, we've gathered six relatively (as everything in life is, so it depends) simple achievements that won't take much time from your busy schedule, offering a favorable exchange for a couple of Fractured Crystals.

All Hidden Achievements 4.0: Part 1

ALL FOUNTAIN hidden ACHIEVEMENTS: Part 2

How to Obtain the Hidden Achievement "Eye for an Eye" in Genshin Impact

The secret to obtaining this achievement lies in returning a shot from the sender-Flitt Luu with subsequent destruction of the last one. You can find the items for future executions here:

Encountering these during your dives isn't rare, it's not an isolated incident. The cannon is embedded in the rock behind the seaweed. 

Borrow the ability from the nearby Xenochromatic Crab. Now you need to catch the moment of Flitt Luu's attack - as soon as the yellow sphere is about to reach you, use the charged skill. Don't be discouraged if you don't succeed on the first try. The action requires a bit of finesse, which you'll quickly develop with a little practice. 

As soon as the enemy is ground into dust by your unexpected retaliation, the achievement "Eye for an Eye" with 5 Primogems will immediately appear as your reward. 

How to Obtain the Hidden Achievement "Natural Philosophy Encyclopedia" in Genshin Impact

Returning to the quest itself, you need to go back to the previously submerged area.

Head towards the glowing book on the table: reading it won't necessarily unveil the lore of the game, but it will teleport you to a spacious bright hall. The achievement "Natural Philosophy Encyclopedia" (5 Primogems) will immediately appear on the screen. There are also rich and precious chests (with the "Shriveled Seaweed" and "Key to Something in the Institute" - these items will be needed later) on the opposite wall. Clicking on the lectern will return you to the semi-ruined institute.

How to Obtain the Hidden Achievement "Study in Black" in Genshin Impact

Here's where the item "Key to Something in the Institute" comes into play (use items selectively: save the "Seaweed" for better times). It's easiest to complete this achievement right after the dealings with the previous one, as there's no need to go far. Walk (then swim) to the left and straight from the teleport point through the labyrinth of one passage, as there's no need to turn more, until you reach a door.

Opening the 2 passages (see screenshots) will catalyze the appearance of the achievement "Study in Black" (5 Primogems). Inside, you'll find a precious chest and a couple of "Mysterious Pages" scattered around the room. You can read about the use and collection of these mysterious scraps in this guide.

How to Obtain the Hidden Achievement "Wind and Waves" in Genshin Impact

Come to the Palace of Mnermonia, to NPC Ayu - as the game itself says in the achievement, "witness his fate." Well, "witnessing" won't bring any difficulties at all (except for a ten-minute melancholic piercing of dialogue lines, which is hard to call active movements). And yes, that's literally all that's required of you (+5 Primogems and the quest rewards).

How to Obtain the Hidden Achievement "The King is Dead, Long Live the King!"

Here, the world boss "Emperor of Fire and Iron" needs to actively cooperate. During battles with it (if they've already happened), you might have noticed a shield. Perhaps (I don't deny it) you intentionally knocked it down, as destroying it stuns the monster. However, for pocketing the achievement, hold off on this, keep the "Emperor's" shield at a minimum.

After some time (often up to one minute of real time), the giant crab buries itself in the sand - so much so that only the crown remains visible. At this moment, you need to break the shield completely.

Done, another 5 Fractured Crystals under a loud poetic name.

How to Obtain the Hidden Achievement "Fountain Message"

Well, lastly, the easiest achievement - it's granted for completing the quest "Fountain Message" (from the "Traces of Tide" series). No pitfalls, just the fact of completion of a short task (a separate guide for which will be added very soon).

The second issue of "Hidden Achievements 4.0" predictably comes to an end. I hope it helped you. We'll talk in future articles!