Genshin Impact | A Perfect Yesterday Achievement Guide

Anemo
Anemo Traveler	Chasca
Jean	Kaedehara Kazuha
Mizuki	Varka
Venti	Wanderer
Xianyun	Xiao
Hydro
Childe	Columbina
Furina	Hydro Traveler
Ayato	Mona
Mualani	Neuvillette
Nilou	Kokomi
Sigewinne	Yelan
Geo
Albedo	Arataki Itto
Chiori	Geo Traveler
Linnea	Navia
Xilonen	Zhongli
Zibai
Electro
Clorinde	Cyno
Electro Traveler	Flins
Ineffa	Keqing
Raiden Shogun	Varesa
Yae Miko
Dendro
Alhaitham	Baizhu
Dendro Traveler	Emilie
Kinich	Lauma
Nahida	Nefer
Tighnari
Pyro
Arlecchino	Dehya
Diluc	Durin
Hu Tao	Klee
Lyney	Mavuika
Nicole	Pyro Traveler
Yoimiya
Cryo
Aloy	Citlali
Escoffier	Eula
Ganyu	Kamisato Ayaka
Lohen	Qiqi
Sandrone	Shenhe
Skirk	Wriothesley

Anemo
Ifa	Jahoda
Lan Yan	Lynette
Prune	Sayu
Shikanoin Heizou	Sucrose
Hydro
Aino	Barbara
Candace	Dahlia
Xingqiu
Geo
Gorou	Illuga
Kachina	Ningguang
Noelle	Yun Jin
Electro
Beidou	Dori
Fischl	Iansan
Kujou Sara	Kuki Shinobu
Lisa	Ororon
Razor	Sethos
Dendro
Collei	Kaveh
Kirara	Yaoyao
Pyro
Amber	Bennett
Chevreuse	Gaming
Thoma	Xiangling
Xinyan	Yanfei
Cryo
Charlotte	Chongyun
Diona	Freminet
Kaeya	Layla
Mika	Rosaria

Last Updated: August 29, 2026 12:35 AM

A Perfect Yesterday Achievement is an achievement in Genshin Impact 4.1. Guide includes A Perfect Yesterday, how to unlock, how to get, map, location, Executive Office, and Fontaine Research Institute of Kinetic Energy Engineering!

Table of Contents

Map Location
How To Unlock Achievement

7.0 Update Related Articles
Odette						Arlecchino
Ineffa						Flins
Cryo Traveler Build Guide						7.0 Redeem Codes

A Perfect Yesterday Achievement Map Location

Located At The Executive Office

Map	In-Game

You will be able to unlock the A Perfect Yesterday achievement after reading a book that is located inside the Executive office, on the east side of the Experimental Field Generator.

A Perfect Yesterday Achievement - How To Unlock

Read The Book To Get The Achievement

Once you have entered the Executive office, go straight to the table indicated on the map above. Interact with the book and after reading it, you will be able to unlock the A Perfect Yesterday Achievement!

Fontaine Related Articles

Map & Puzzle Related

Map & Collectibles
Hydroculus		Shrine of Depths
Local Specialties & Materials
Marcotte	Lumidouce Bell		Rainbow Rose
Tidalga	Beryl Conch		Romaritime Flower
Lumitoile	Subdetection Unit		-

Fontaine Domains

Artifact Domains

Domain	Key Drops
Denouement Of Sin
Faded Theater
Waterfall Wen

Talent Book Domains

Domain	Key Drops
Pale Forgotten Glory

Weapon Ascension Material Domains

Domain	Key Drops
Echoes of the Deep Tides

Weekly Boss Domains

Domain	Key Drops
Shadow of Another World

Fontaine Characters

Fontaine 5 Star Characters
Clorinde	Emilie	Escoffier	Furina
Lyney	Navia	Neuvillette	Sigewinne
Wriothesley	-	-	-
Fontaine 4 Star Characters
Charlotte	Chevreuse	Freminet	Lynette

Other Fontaine Guides

Other Fontaine Guides
Fontaine Forgeable Weapon	Fontaine Fishing Spot
Fontaine Aircrafts	Fontaine Luxurious Chests
Mysterious Ore	Thorny Cyst
Pufferfruit Challenge	Potential Energy Orb
Anecdota Septentrionalis Book	-

DPS				Support				Sustain
On-Field						Off-Field

Mondstadt	Liyue
Inazuma	Sumeru
Fontaine	Natlan
Nod-Krai	Snezhnaya

Alyosha	Danica
Mitya	Noy
Odette	Tsaritsa
Valeriy	Vesna
Vodyanitsa

Anemoculus			Shrine of Depths
Calla Lily			Cecilia
Dandelion Seed			Philanemo Mushroom
Small Lamp Grass			Valberry
Windwheel Aster			Wolfhook

Geoculus			Shrine of Depths
Cor Lapis			Glaze Lily
Jueyun Chili			Noctilucous Jade
Qingxin			Silk Flower
Starconch			Violetgrass