Here is the full list of all 23 Legends of Aethereus achievements.
Die when playing a Hardcore Character at least of Level 15
Revive 15 Party Members
Complete all levels of Last Stand Extreme
Complete all levels of The Last Stand Extreme in Hardcore Mode
Complete level 15 of the Last Stand Extreme in Hardcore Mode
Complete level 10 of Last Stand Extreme
Complete level 10 of Last Stand Extreme in Hardcore Mode
Complete level 5 of Last Stand Extreme
Complete level 5 of Last Stand Extreme in Hardcore Mode
Complete the first level of Last Stand Extreme
Finish Alanas quest line
Finish the Obatymos quest line
Reach 80 in the Attribute 'Intuition'
Complete all levels of Last Stand
Complete level 10 of Last Stand
Complete level 5 of Last Stand
Build 10 statues
Complete five quests
Craft an item with two stars
Build one statue
Craft one item
Complete the first level in Last Stand
Complete one quest