How to Unlock Hidden Achievements( Part 2) HSR 4.0

Mastering the latest update in Honkai: Star Rail  requires more than just completing the main story; it's about uncovering the secrets hidden within Duomension City and beyond.

This comprehensive guide details the HSR 4.0 hidden achievements and provides step-by-step instructions for the most challenging trophies.

 

Complete HSR 4.0 Hidden Achievements List

Below is the full breakdown of the new hidden achievements added in version 4.0. Check which one you have not completed.

Type	Name	Requirements
Eager for Battle	Straight Fire Unreal Banger	Use ally character Sparxie to activate "Engagement Farming" and accumulate 9 "Straight Fire" stacks in a single battle
	Trap Within a Trap	Use ally character Sparxie to trigger "Engagement Farming" a total of 10 times in a single action
	Lucky Charm	Use ally character Yao Guang to trigger "Great Boon" 18 time(s) in a single battle
	May the Fortune Be With You	Obtain a total of 8 "Fortune Pouch(es)" through Yao Guang's Technique "Untethered Glimmer Sails Far"
	All for the Show	Aha uses "Aha Instant" and only deals 0 DMG
	Who's Laughing Now?	Aha uses "Let There Be Laughter" to defeat 1 enemies
Moment of Joy	Safety Comes First on Every Road	Get up close and personal with a car in the middle of Duomension City's streets
	Go to A New World	Hit by a hydro-car during an Interplanar Jump! sequence
The Memories We Share	Time For Whispers	Infiltrate the CEO's conference room
	Aeonic Silence	Admire the portraits of the Aeons in the Tavern
	The Fool and the Alchemist's Gate	Build your own elemental toilet
	Block Subspace	Uncover the secrets of the golden throne
	Reunion is Prologue	Witness Bequea's ultimate journey back into the television
	If I Can Bring You Happiness	Witness Bequea and Rocket fulfill their promise to become family
	Hardboiled Detective	Work with Ashveil to stop the "Millennium Killer's" atrocities using traditional yet effective methods
	Armchair Detective	Together with Sparxie, use the latest and most cutting-edge modern methods to make the "Millennium Killer" get a taste of their own medicine
	Dandelion's Judgment	Let Sapone fulfill their wish
	The Crime is "Love"	Have Sorren accept lawful punishment
	Make Dough with Dignity	Select to sell the pixel plane game to the IPC
	Walk with the Divine Sage	Reject the IPC's attempts to acquire the pixel plane game
	Sunset VI	Fulfill Kraken's wish to roam beyond the sky
	Encyclopedia of Scams	Forcefully reject the eloquent Master Moon
	A Bet to End All Bets	Spend a fortune for the honor of being the only one of Master Moon's "disciples" to be fooled
	Homo Economicus	Escape when faced with the eloquence of Master Moon
Fathom the Unfathomable	When The Phantasmoon First Shone Upon Mortals	Head to the @Gate of Duomension City and gaze upon the Phantasmoon
	Ascend to the Peak of Trailblaze	Reach the top of the Trailblazer's poster in Duomension City
	Catherine	After being dragged into the 2D world by Sparxie, successfully obtain a new form and escape
	Hold On Tight and Put Phones Away	Use an escalator once in Planarcadia
	Don't Try This At Home	Move against the escalator for 10 seconds or more
	Ping Pong	In the "Jump Time" of "Interplanar Jump!" at Perdido Station, repeatedly change gravity to make the wispae bounce back and forth
	Secret Storage Room	Enter the secret room in Graphia Academy's indoor gymnasium
	Lonely Are All Bridges	Reach the hidden plane during an "Interplanar Jump!" on Dovebrook Bridge in Duomension City
	Thorny Mask	Survived after taunting the Fool's Mask at the tavern
	Super Third Wheel	Witness the love of the paper crane
	Why'd You Do That?	Knock down the Billboard running in the tavern
	Here Used to Be Dragons	Find the treasure hidden at the end of the Grand Treasury
	Let's Not Trailblaze Here	Open the secret room of the Golden Confessional
	Let Out a Wistful Tweet	Find a familiar feather in the tavern
	2D Aficionado	Complete the Ultimate 2D Challenge on Blisstar
	Curving Arrow	In "Interplanar Jump!," shoot an arrow that curves in flight
	Springleg Jack	Bounce 10 times in Trampoline: Introductory Training
	Let's Go Karaoke!	Eavesdropping on a mesmerizing melody echoing from the karaoke bar in the heart of Duomension City or Dovebrook District

Step-by-Step Tutorial to Obtain Hidden Achievements

When The Phantasmoon First Shone Upon Mortals

Head to the @Gate of Duomension City and gaze upon the Phantasmoon.

Teleport to this point and proceed straight ahead.

Turn at the corner and interact.

Follow the route map and teleport to “2” to complete the achievement.

Ascend to the Peak of Trailblaze

Reach the top of the Trailblazer's poster in Duomension City.

Teleport to the red-circled waypoint.

Follow the designated route and clear the path.

Once you reach the red-circled interaction point, interact to complete the achievement.

Catherine

After being dragged into the 2D world by Sparxie, successfully obtain a new form and escape.

Hold On Tight and Put Phones Away

Use an escalator once in Planarcadia

Teleport to this location.

Walk up to the escalator.

Ride the escalator.

Don't Try This At Home

Move against the escalator for 10 seconds or more.

Ping Pong

In the "Jump Time" of "Interplanar Jump!" at Perdido Station, repeatedly change gravity to make the wispae bounce back and forth.

Interact with the button to enter Interplanar Jump! Difficulty I.

Move back and forth along the arc from both ends several times to complete the achievement.

Secret Storage Room

Enter the secret room in Graphia Academy's indoor gymnasium.

Interact with the button to enter Interplanar Jump! Difficulty V.

Follow the path to clear the stage. The storage room door will open—walk inside to obtain the achievement.

Lonely Are All Bridges

Reach the hidden plane during an "Interplanar Jump!" on Dovebrook Bridge in Duomension City.

Proceed to the designated spot to unlock the achievement automatically.

Thorny Mask

Survived after taunting the Fool's Mask at the tavern.

Go upstairs in the "World's End" Tavern and locate the interaction point.

Survived after taunting the Fool's Mask at the tavern.

Super Third Wheel

Witness the love of the paper crane.

From Frame 5 in the tavern, turn into the side area next to it.
Interact with the button to enter Interplanar Jump! Difficulty III.

Complete the stage to witness the love of the paper crane and unlock the achievement.

Why'd You Do That?

Knock down the Billboard running in the tavern.

Interact with all the Frames here. In the lobby, you will find Frame 1, 2, 4, and 7.

Head to the second floor and interact.

After exiting, continue upstairs and interact with Frame 6, 3, and 9.

Finally, knock down the Billboard to obtain the achievement.

Here Used to Be Dragons

Find the treasure hidden at the end of the Grand Treasury.

Let's Not Trailblaze Here

Open the secret room of the Golden Confessional.

Enter Interplanar Jump! Difficulty IV.

Clear the challenge successfully to obtain the achievement.

 

Let Out a Wistful Tweet

Find a familiar feather in the tavern.

Teleport to this point.

Proceed straight ahead and interact with Lady Vermilion. During the dialogue, select the first option, “Memories are the prelude to dreams.” Complete the conversation to receive the reward.

2D Aficionado

Complete the Ultimate 2D Challenge on Blisstar.

Curving Arrow

In "Interplanar Jump!," shoot an arrow that curves in flight.

Springleg Jack

Bounce 10 times in Trampoline: Introductory Training.

Talk to Xiao Gao and start the interaction.

Pull the lever above, then bounce back and forth at the red arrow location to complete the achievement.

Let's Go Karaoke!

Eavesdropping on a mesmerizing melody echoing from the karaoke bar in the heart of Duomension City or Dovebrook District.

Teleport to this point.

Walk to this doorway.

Just standby in front the door, While listening to people singing, it takes a little longer, about 5-6 minutes.

Conclusion

That wraps up Part 2 of the hidden achievements under the [Fathom the Unfathomable] category in Honkai: Star Rail 4.0. As you can see, this patch isn’t just about pushing story quests in Duomension City — it’s about getting hit by cars on purpose, riding escalators like it’s a sightseeing tour, provoking masks in taverns, and willingly spending a fortune just to prove you’re the biggest clown in Master Moon’s classroom. Peak Trailblazer behavior.

And if you’re burning through stamina, tickets, or just your sanity while chasing these, make sure your Stellar Jades are stocked. LDShop keeps things simple — fast, stable HSR top up, transparent pricing, no drama. Less time worrying about recharge, more time bouncing wispae like you’re playing cosmic table tennis。