Here is the full list of all 37 Six Ages 2: Lights Going Out achievements.
Win the game at the Harsh difficulty level
Win the game at the Hard difficulty level
Win the game at the Normal difficulty level
Win the game at the Easier difficulty level
Win a game of Prolonged duration
Kill Teghern
Win the game without anyone starving
Win at Easier difficulty without restoring to a previous save
Win at Normal difficulty without restoring to a previous save
Win at Hard difficulty without restoring to a previous save
Win at Harsh difficulty without restoring to a previous save
Win five times
Win ten times
Fall into cannibalism
The lineage of Beren and Redalda ends
Your clan has to disband
Fail in the dead world
Lose because of gorp
Lose when the world dissolves into slime
Visit the divine wedding
Defeat Nontraya
Hoard 25 treasures
Defend Berenstead against Elmal’s Chaos foes
Send an emissary to every clan
End a feud
A clan leader gains illumination
Send a caravan to every clan
Win with Iverlantho as king
Explore the Valley and beyond
Build a shrine to every deity
Meet a character from “Ride Like the Wind”
Gain the allegiance of ten spirits
Split the Clan
A Humakti achieves their destiny
Continue a game from “Ride Like the Wind”
Select a Trickster to lead the clan
Discover the easter egg