Full list of all 27 Ikenfell achievements worth 1,000 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox One.
Defeated Turmoil
Defeated Ibn & Bax
Defeated Beacon
Defeated Adorable Kitten
Defeated Gilda
Defeated Chuckles
Defeated Blackhat
Defeated Gilda 1-on-1
Defeated the Snatcher
Defeated Twinkle
Defeated Ibn, Bax & Gilda
Defeated the Ghost Legion
Defeated Radegund
Defeated Bloodwyn
Defeated the Gardener
Defeated Agony
Defeated the Unseen
Defeated Aeldra
Defeated Fantom
Defeated Codexus
Defeated the Allcat
Defeated the Specters
Bought All Gem Accessories
Upgraded All Gem Accessories
Found the Book of Alchemy
Thank You For Playing
The Allcat Watches Over You