What Bastion Remembered

Today, we found out the secret about this achievement and how it works ! Characters are tied to different SHARDS. You then can focus on specific characters without having to do the world quest hundreds of times to get the one you need. We also found out that the "saying" (dialog) that could give progress towards the achievement was the last one, on 9th or 10th scrolls. Abusing this, you can finish the achievement on one go. Look at these steps :

1) Go to 9/10 on world quest "Things Remembered"
2) Get some friend (who are on others shards/servers) and make them inviting you OR you can enter on some custom groups(questing/raid (if it's the Valinor's week especially)) and make sure that you are on "raid mode". Make sure the character on another shard who invites you is in BASTION, or you'll not be phased on their shard.
3) Once on raid mode, click on a scroll and you'll see what is the character. If you didn't have it yet, it will count for progress.
4) Repeat the process with different shard/realms/warmode until you finish the achievement.

Remind going on raid mode every time or you'll have to wait until next time the world quest comes.

KLEIA doesn't spawn as of 4th February 2021, probably bugged. I suggest you to in-game bug report her to have it fixed fast. She's the only that NOBODY in the world has found in any way (even the top tier achievements hunters). I will update it when she's fixed.

EDIT : As of Today (11st March 2021), and after 9.0.5 release, Kleia is fixed and this achievement can now be finished.

Think for this achievement you need to complete a sequence of memories for each character. Got Pelagos credit after getting 5 memory "sayings".
Each character is probably also on rotation for when the world quest is up. Pelagos one day, another the next. Will test and give update next time world quest is up.

Update! Got Eridia this time. Can confirm now, need to get 5 sayings to get credit.

Did this World Quest and didn't get credit towards any of those listed. Is there something special that needs to be done during the world quest?