[Ys I] Easy difficulty isn't allowed unless stated in the achievement's description

[Ys I] In Port Barbado, obtain a Short Sword from Slaff

[Ys I] Achieve your first level up

[Ys I] After Julius warns you about crossing the bridge, obtain the Golden Vase before entering Minea for the first time

[Ys I] Thanks to some bargaining with Pim, get him to reduce all his prices by 10%

[Ys I] When selling something to Pim, convince him to offer an extra 10% to anything you sell him

[Ys I] Cheer up Donis in Minea's bar by finding and returning his Sapphire Ring.

[Ys I] While you might want to start your search for the Books of Ys now, speak to Sara to learn what you need before your quest begins

[Ys I] After getting a full set of equipment, obtain Sara's Crystal from the Fortuneteller Sara

[Ys I] Obtain and drink the Bestiary Potion. Now you can view enemy stats in the Note section!

[Ys I] Speak with Sara's aunt Jeba and be given the Shrine Key

[Ys I] Defeat the vanishing wizard Jenocres in the Shrine

[Ys I] Defeat Jenocres while hitting them every time they appear

[Ys I] Defeat Jenocres without taking damage

[Ys I] Find the Shield Ring in the Shrine

[Ys I] Open every treasure chest in the Shrine

[Ys I] Defeat the oversized centiped Nygtilger in the depths of the Shrine

[Ys I] Defeat Nygtilger without taking damage

[Ys I] Rescue Feena from her cell in the lower levels of the Shrine

[Ys I] Help Feena in trying to earn a level up

[Ys I] A deadend is a great spot for measuring stuff, even things left out of one's autobiography

[Ys I] Defeat Nygtilger and open all chests in the entire Shrine before escorting Feena out of the Shrine

[Ys I] Earn the Goban character note after getting the ones for Lugan the Thief and Morgan the Thief

[Ys I] Receive the Power Ring for returning the Silver Bell to Mayor Robels

[Ys I] Obtain every treasure in the Plains

[Ys I] For telling Slaff about your adventure so far, receive a Talwar for free

[Ys I] Help the sleepwalking ministrel, Luta Gemma, return home to his wife. He won't get in danger again... right?

[Ys I] Obtain your second Book of Ys in the Town of Minea

[Ys I] After getting the Volume of Tovah, speak with Goban to hear his suspicions regarding Sara's attacker

[Ys I] Return Reah's Harmonica and hear her melody atop the ramparts of Minea

[Ys I] Hear Reah's poem for returning both of her missing items

[Ys I] Receive a gift from one of the Roda Trees

[Ys I] Find the Timer Ring in the Abandoned Mine

[Ys I] Find the Heal Ring in the Abandoned Mine. Now you can heal in dungeons or even faster everywhere else!

[Ys I] Open every treasure chest in the Abandoned Mine

[Ys I] Reach the max level of 10

[Ys I] Defeat the beast of the night Vagullion in the depths of the Abandoned Mine

[Ys I] Defeat Vagullion with a weaker armor and shield (Tier 3 or lower)

[Ys I] View the scene with Feena by the lake

[Ys I] Enter Darm Tower (anything outside the tower is missable beyond this point!)

[Ys I] Have Dogi break into all three prison cells in Darm Tower

[Ys I] Defeat the giant mantis Pictimos in Darm Tower

[Ys I] Defeat Pictimos without taking damage

[Ys I] Defeat the rock tornado Khonsclard in Darm Tower

[Ys I] Defeat Khonsclard with at least 50% of your max HP remaining

[Ys I] I'm calling out, please tell me what to do... oh a Monocle to read the Books of Ys myself

[Ys I] For showing him his lost book, obtain the Blue Amulet from Luta Gemma

[Ys I] Open every treasure chest in Darm Tower, not counting the tier 3 equipment.

[Ys I] Defeat the demon heads Yogleks & Omulgunin in Darm Tower

[Ys I] Defeat Yogleks & Omulgunin while always staying on the left or right side of the giant mirror (starts once you've moved into position)

[Ys I] Defeat the fallen descendant Dark Fact atop Darm Tower

[Ys I] Defeat Dark Fact without destroying the circle symbol in the center

[Ys I] Enjoy listening to the final boss music by surviving for a minute againt Dark Fact, must have the core setting "Duplicate Frames in 30 Hz" enabled

[Ys I] After defeating Dark Fact, read the sixth Book of Ys to complete your adventure in Esteria

[Ys I] Obtain all three pieces of the first equipment set

[Ys I] Obtain all three pieces of the second equipment set

[Ys I] Obtain all three pieces of the third equipment set

[Ys I] Obtain all three pieces of the fourth equipment set

[Ys I] Obtain all three pieces of the fifth equipment set

[Ys I] Obtain every character entry in the notebook (Three can be found in Darm Tower, but one of those could be obtained earlier)

[Ys I] Fill out all the information for all enemies found before Darm Tower

[Ys I] Fill out all the information for every normal enemy

[Ys I] Defeat Jenocres on Nightmare Difficulty

[Ys I] Defeat Nygtilger on Nightmare Difficulty

[Ys I] Defeat Vagullion on Nightmare Difficulty

[Ys I] Defeat Pictimos on Nightmare Difficulty

[Ys I] Defeat Khonsclard on Nightmare Difficulty

[Ys I] Defeat Yogleks & Omulgunin on Nightmare Difficulty

[Ys I] Beat the game on Nightmare difficulty

[Ys I, Easy Allowed] Obtain all three pieces of the fourth equipment set before fighting Nygtilger

[Ys I, Easy Allowed] Complete the game with minimal equipment (tier 1 sword, shield, and armor, tier 4 sword, shield, and armor, tier 5 sword, and Evil Ring)

[Ys I, Easy Allowed] Reach the end of your journey with a playtime of 65 minutes or less

[Ys I, Time Attack] Defeat Jenocres in under 35 seconds

[Ys I, Time Attack] Defeat Nygtilger in under 25 seconds

[Ys I, Time Attack] Defeat Vagullion in under 3 minutes

[Ys I, Time Attack] Defeat Pictimos in under 25 seconds

[Ys I, Time Attack] Defeat Khonsclard in under 15 seconds

[Ys I, Time Attack] Defeat Defeat Yogleks & Omulgunin in under 30 seconds

[Ys I, Time Attack] Defeat Dark Fact in under 30 seconds

[Ys I, Time Attack] Complete Time Attack in 6:00 or less

[Ys I, Time Attack] Complete Time Attack in five minutes and fifteen seconds or less

[Ys I] Defeat Nygtilger while wearing the Mask of Eyes

[Ys I] Defeat Vagullion while wearing the Mask of Eyes

[Ys I] Defeat Pictimos while wearing the Mask of Eyes

[Ys I] Defeat Khonsclard while wearing the Mask of Eyes

[Ys I] Defeat Yogleks & Omulgunin while wearing the Mask of Eyes

[Ys I] To ensure no accidents happen, have Goban take a consumable transportation item

[Ys I, Easy Allowed] Open the three chests in Darm Tower containing the tier three equipment

[Ys I] Losses aren't always a bad thing, sometimes you find what you need because of them

[Ys I] Learn part of the tale that took place 700 years ago

[Ys I] With the help of a hammer, quiet down the Devil's Corridor

[Ys I] Defeat Pictimos without taking damage on Nightmare Difficulty

[Ys II] Receive the gift of magic from the Goddesses.

[Ys II] Defeat Velagunder.

[Ys II] Return all six Books of Ys.

[Ys II] Cure Lilia and get Return magic.

[Ys II] Make an ice bridge in the Ice Ridge.

[Ys II] Defeat Tyalmath.

[Ys II] Trick Ruba into telling the truth, and reveal your ruse.

[Ys II] Use the Roda Leaf to cross through the poisonous gas.

[Ys II] Liberate Tarf from his prison and agree to escort him home.

[Ys II] Defeat Gelaldy.

[Ys II] Get the Lila Shell from Hadat.

[Ys II] Eavesdrop on the meeting and learn the Temple password.

[Ys II] Get "cursed"... to be adorable.

[Ys II] Dispel the curse of Dalles.

[Ys II] Unwittingly bring tragedy to the Runaways' Hideout.

[Ys II] Defeat Druegar.

[Ys II] Get the Waterway Key from Keith.

[Ys II] Defeat Zava.

[Ys II] Climb the bell tower, talk to Dalles, and lose all hope.

[Ys II] Find the Black Pearl... again.

[Ys II] Liberate the villagers in the Hideout.

[Ys II] Defeat Dalles.

[Ys II] Play the harmonica and liberate the Goddesses.

[Ys II] Defeat Darm and save the world.

[Ys II] Defeat Darm without using shield magic. (Normal difficulty or higher)

[Ys II] Defeat Velagunder on Nightmare difficulty.

[Ys II] Defeat Tyalmath on Nightmare difficulty.

[Ys II] Defeat Gelaldy on Nightmare difficulty.

[Ys II] Defeat Druegar on Nightmare difficulty.

[Ys II] Defeat Zava on Nightmare difficulty.

[Ys II] Defeat Dalles on Nightmare difficulty.

[Ys II] Defeat Darm on Nightmare difficulty.

[Ys II] Defeat Tyalmath without taking damage. (Normal difficulty or higher, no Time Attack)

[Ys II] Defeat Gelaldy without taking damage. (Normal difficulty or higher, no Time Attack)

[Ys II] Defeat Druegar without taking damage. (Normal difficulty or higher, no Time Attack)

[Ys II] Defeat Zava without taking damage. (Normal difficulty or higher, no Time Attack)

[Ys II] Defeat Dalles without taking damage. (Normal difficulty or higher, no Time Attack)

[Ys II] Defeat Darm without taking damage. (Normal difficulty or higher, no Time Attack)

[Ys II] Reach level 55.

[Ys II] Collect 99,999 gold.

[Ys II] Collect all tier 1 equipment.

[Ys II] Collect all tier 2 equipment.

[Ys II] Collect all tier 3 equipment.

[Ys II] Collect all tier 4 equipment.

[Ys II] Collect all tier 5 equipment.

[Ys II] Collect all tier 6 equipment.

[Ys II] Collect all magic.

[Ys II] Collect all equippable accessories.

[Ys II] Buy the elixir.

[Ys II] Completely fill the inventory screen.

[Ys II] Fill out the NPC collection by speaking to every NPC in the game.

[Ys II] Fill out every detail of the non-boss bestiary entries.

[Ys II] Commune with the Goddesses in Moondoria Ruins.

[Ys II] Commune with the Goddesses in the Ice Ridge of Noltia.

[Ys II] Commune with the Goddesses in the Moat of Burnedbless.

[Ys II] Commune with the Goddesses in Temple Hadal.

[Ys II] Experience gnosis by communing with the Goddesses themselves.

[Ys II] Find and collect all items in Ruins of Moondoria in one session. (No dying or loading)

[Ys II] Find and collect all items in Rasteenie Mine and Toal Sanctuary, before the boss, in one session. (No dying or loading)

[Ys II] Defeat Velagunder without taking damage. (Normal difficulty or higher, no time attack)

[Ys II] Find and collect all items in Rasteenie Mine, after the boss, in one session. (No dying or loading)

[Ys II] Find and collect all items before the boss in the Ice Ridge of Noltia in one session. (No dying or loading)

[Ys II] Find and collect all items in Moat of Burnedbless in one session. (No dying or loading)

[Ys II] Find and collect all items in the Solomon Shrine.

[Ys II] Find and collect all items in the Subterranean Canal and the Ancient Core of Ys.

[Ys II] Clear Time Attack without healing.

[Ys II] Clear Time Attack.

[Ys II] Clear Time Attack in 8 minutes or less.

[Ys II] Clear Time Attack in 5 minutes or less.

[Ys II] Re-gift an apple to the person who gave it to you.

[Ys II] Meet Lilia on the promontory behind Lance Village.

[Ys II] Get a free Short Sword.

[Ys II] Get some gold coins from the Village duck to live longer.

[Ys II] Defeat Velagunder without returning any of the Books of Ys. (Normal difficulty or higher)

[Ys II] Destroy Velagunder's claws before defeating it. (Normal difficulty or higher, no Time Attack)

[Ys II] Permanently clear out Gila's entire basement.

[Ys II] Find the boss's hidden chest in the Ice Ridge of Noltia.

[Ys II] Raise Tarf up to level 25.

[Ys II] Get outclassed by Tarf. [Adol's level <= 24]

[Ys II] ... "measure" Tarf.

[Ys II] Eat all three Roda Fruit from around the world in one session.

[Ys II] Talk to the guard where the Goddess Pendant used to be.

[Ys II] I don't know who you are but I don't appreciate your attitude.

[Ys II] Try and enter the Canal Hideout while transformed.

[Ys II] Talk to Banoa while Lilia is... indisposed.

[Ys II] Try an innovative solution to your problems in front of Maria.

[Ys II] Climb into three beds that don't belong to you. Creep.

[Ys II] Eat four special homemade foods in one session.

[Ys II] Beat the game in under 2 hours.

[Ys II] Complete the game without picking up any armor or shields. (Normal difficulty or higher, challenge starts when a sword is equipped)