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