For Tales from Candlekeep: Tomb of Annihilation players who are collecting the Legendary Crafter achievement, this guide will help you out.
How to earn “Legendary Crafter” аchievement
Download my save files and copy in …\Steam\steamapps\common\Tales from Candlekeep\Save
Then launch game, click Resume. Craft Artus and Asharra legendary accessories and Dragonbait legendary main weapon.
As bonus you get “I am Legend!” achevements. But only three. Birdsong already have all legendary items for her achievement in my save file.