Full list of all 11 Korgan achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
All achievements
Achievements they've won
Achievements they've not won
Complete the Prologue
Complete the Prologue and all their secondary quests
Defeat Treant boss
Defeat Leviathan boss
Use the teleporter to travel between zones
Disarm 10 traps with the Hunter in single-player mode
Defeat Spider Queen boss
Die 10 times in single-player mode
Get 1k of crystals in single player
Kill 10 enemies while they are frozen
Kill 10 enemies