Here is the full list of all 46 Sorcerer King: Rivals achievements.
Use the Sovereign's magic to intervene in a tactical battle
Equip a champion with items in every slot
Settle a new city
Get a city to level 5
Use pioneers to upgrade an Outpost
Reach level 5 with a champion
Use a pioneer to build an Outpost
Craft an item
Win a tactical battle
Claim a Shard
Build your first city improvement
Lower the Doomsday Counter
Complete a Quest
Play for 5 hours
Play for 15 hours
Play for 40 hours
Play for 100 hours
Channel the focus of your Magic between Mana, Lore, and Sovereign Skill
Complete a Champion Quest to recruit a new Champion to your cause
Reach level 15 with a champion
Ally with a Minor Faction
Defeat a Minor Faction that has sided with the Sorcerer King
Found 5 additional cities in a single game
Get a city to level 9
Slay Vetrar
Slay Aegethon
Destroy one of the Sorcerer King's Strongholds
Kill an enemy with a pioneer attack
Win a "predicted defeat" tactical battle
Win a "predicted defeat" tactical battle without taking damage
Win 20 "predicted defeat" tactical battles without taking damage
Complete the Campaign
Win a game on Insane Difficulty
Win a game without a single shard destroyed
Win as the Guardian
Win as the Tyrant
Win as the Wizard
Win as the Priest
Win as the Tinkerer
Win as the Commander
Win as Undead
Win as Frozen Realm
Defeat Nabunihr
Defeat Abeix
Defeat Corvos
Achieve Ascension Victory