Here is the full list of all 32 Elderand achievements.
Defeat Sserthris
Defeat Erik Zan
Defeat Black Virtue
Defeat Eloria
Defeat Elderu'tamah
Defeat Amon
Defeat Dan’nuhrr
Defeat the Chaos touched reject
Defeat the Chaos touched reject trio
Take the throne
Put an end to the cult
Explore 100% of the map
Unlock the fast travel
Refine an equipment to the max
Help Eran
Forge the Glimpse of the titan
Free Elderu'tamah
Win in the arena mode
Make a potion for the first time
Upgrade your equipment for the first time
Find Pascal's hammer
Defeat Rok'naar
Help Guam
Defeat Shakna
Collect 30k gold
Get to level 100
Perform all rituals
Purge all evil
Collect all the notes
Save Eloria
Perform a special attack for the first time
Kill 50 Mysterious Mourner