Missable

In ending E's path, when you get to play as Kaine, cam under her skirt until you get knocked away. On the 10th time, you will get a game over and the achievement.

NOTE: Can only be done on a route C/D playthrough

Beat this boss on easy mode while skipping all cutscenes, with the game locked at 60fps.
Both >60fps (as of initial game launch), and cutscene time count against your timers.

The Strongest Bond is for the berserk Kainé after the shadowlord fight.

Beat this boss on easy mode while skipping all cutscenes, with the game locked at 60fps.
Both >60fps (as of initial game launch), and cutscene time count against your timers.

Doing these when on a C/D playthrough is recommended, as some bosses require being on that playthrough anyways

If you download the free "NieR Replicant 4 YoRHa" dlc, you can do those recipes very easily, and this will let you skip leveling Iron Will, and 3 other weapons of your choice. This can be a nice boost when RNG isn't going your way for all the rare drops.

This ONLY counts for the weapons in the original Neir RepliCant/Gestalt release. This can be obtained completely on your first playthrough if you wish.

The following weapons don't count:

• NieR Replicant 4 YoRHa dlc weapons
• Weapon for completing Ending E

Here's a full list of weapons you'll need:

Requirement: Complete the quest "Boar Hunt" in Part 1 (young Nier) to unlock the ability to ride boars.

Then get on a boar's back and stay there for 5 minutes. You don't actually have to run around. This is easiest in part 1 where there aren't many enemies to deal with.

Route C/D only

Upon starting this route, you will be asked if you want to see Kainé's dreams (or something similar) - say yes to get several full-screen pages of backstory.

You will get a few more of these through the run, skip none of them. The last one is after defeating Devola and Popela. Read through it and get your cheevo.

Unmissable storyline achievements

As you play through the 5 endings of the game, you will get the following cheevos:

Route A

• The Book of Legend
• The Wild Companion
• The Magic Man
• The Mellow Companion
• Release
• Key Collector
• A World in Flux
• Call Her Back

Route B

• Lingering Memories

Route C/D

• Gratitude
• Thank You (Choose 'Kill' for ending C after fighting post-shadowlord boss)
• Something Very Special (Choose 'Sacrifice' for ending D after fighting post-shadowlord boss) - DO ENDING C BEFORE THIS

Route E

• e8 a8 98 e6 86 b6 e3 82 b5 e3 83 bc e3 83 90 e3 83 bc

Missable

Can only be done in Part 1 as Young Nier. Kill 100 sheep. Easiest after you meet Weiss, and can use magic.

Start a new game and get to ending A within 15 hours of played time.

If doing a 'victory lap': skipping all cutscenes, playing on easy, etc - this should be 5 hours or less.

These can be done in the very beginning of the prologue with your pipe weapon. It can also be done on either easy or hard as there are tons of Shades and one boss, just make sure not to lose the combo which is easy to maintain.

There are a total of 71 sidequest, since it is long unlike the weapon tables in this guide, I will be posting the link here.

In summary, total breakdown are:
Act I: 36
Act II: 35
Side Quests Guide

Story Related. You must find all 8 Sealed Verses, 2 are given to you in one area but the others are part of the story as they mentioned it. The list for them goes:

Dark Blast - This is the first Unsealed Verse that the player will acquire during the course of the game. Players get this Verse by reaching the Lost Shrine. It is a long-range magic attack that allows the player to throw a magic bolt at their enemies.

Dark Lance - By defeating Hansel and Gretel within the Lost Shrine the player will acquire this Unsealed Verse. It is a long-ranged spear attack that can be charged up to deal even more damage against enemies.

Dark Hand - Once the player has defeated Hook at The Aerie they will be able to then use Dark Hand. With Dark Hand, the player can charge up and release an AOE attack that will crush enemies into the ground. Charging this ability increases both damage and the range, and it can also be used to reduce enemy armor.

Dark Phantasm - The player will need to defeat Hook once again when they revisit The Aerie later in the game to get their hands on Dark Phantasm. This will summon a magical doppelganger of NieR that attacks enemies with an AoE effect.

Dark Gluttony - After the player manages to bring down Defense System Gepetto in the Junk Heap they will be able to use Dark Gluttony to defeat their enemies. By holding the charge button down the player will be able to put up a barrier that absorbs energy orbs, which can then be fired back in a single direction at an enemy.

Dark Wall - Once players get to the Barren Temple and defeat Shahriyar they will acquire Dark Wall. This Unsealed Verse is a barrier spell that will block all incoming attacks. If the player charges the spell up they can trigger a much larger barrier.

Dark Execution - This is the only other Verse that isn't acquired by defeating a boss in combat. Players will get this instead by helping the Mayor out of the Deathdream in Forest of the Myth. Dark Execution will allow the player to summon spikes out of the ground to impale their enemies.

Dark Whirlwind - The final Unsealed Verse is picked up once players defeat Grimoire Rubrum at Emil's Mansion. Whirlwind gives players the ability to summon deadly blades that spin around their body. Charge this up to deal more damage against enemies.

Shame on me for copy and pasting but for now stick with this as there are plentiful amount of useful informations:
https://screenrant.com/nier-replicant-remaster-unlock-every-sealed-verse/

This is ultimately a missable achievement, you will get to the point on end-game and if you miss this without knowing well good luck you need to play Ending D again and trigger that to ultimately get Ending E again just to peek her underneath 10 times >:)

However do not worry you may be tempted to do this achievement if you are that type so wait for a good second just like Automata on 2B.