Here is the full list of all 82 Circle Empires achievements.
Defeated Mahu the Mad Dragon
Defeated Neu-Morg the Master Necromancer
Kill 10 necromancers in a single game
kill 50 vampires in a single game
Defeated Hur the Hungry Dragon
Defeated Voltaire the Vicious Vampire
Kill 10 necro towers in a single game
Achieve a total score of 1 000 000
Defeated Gruff the Goblin General
Defeated Morgana the Mother of Monsters
Have a level 6 vampire in your army
Defeated Geld-Zom the Ghastly
Have 10 or more level 2 horse archers in your army
Have 10 or more max level archers in your army
Achieve a total score of 100 000
Defeated Ron the Rebel King
Detonate 10 explosive mushrooms
Have 3 or more wizards in your army
Spawn 5 Ice Hunters
Win vs AI Players on Nightmare difficulty on any map
Kill 2 enemy catapults
Win vs AI Players on Extreme difficulty on any map
Spawn 20 Merman Archers
Spawn 50 frog workers
Win vs AI Players on Hard difficulty on any map
Spawn 10 pumpkin necromancers
Spawn 10 pumpkin-men
Spawn 10 catapults
Win vs AI Players on Normal difficulty on any map
Win Full Conquest mode on Hard difficulty on any map
Win Full Conquest mode on Impossible difficulty on any map
Win Full Conquest mode on Nightmare difficulty on any map
Win Full Conquest mode on Extreme difficulty on any map
Win on an Extra Large map
Have 100 or more axe throwers in your army
Spawn 3 level 3 banks
Have 100 workers
Level a swordsman to max level
Win on a Large map
Defeated Reeker the Red Dragon
Have 3 or more necromancers in your army
Kill 50 zombies in a single game
Have 100 or more zombies in your army
Accumulate 200 000 gold
Have 100 or more goblins in your army
Have 20 ghosts or frost ghosts in your army
Accumulate 50 000 gold
Accumulate 20 000 gold
Amass 10 000 gold
Built 16 or more walls in a single game
Have 100 or more swordsmen in your army
Achieve a total score of 10 000
Defeated Arg the Anger Lord
Have a level 5 vampire in your army
Acquire all unit upgrades
Harvest a max level pumpkin
Amass 10 000 wood
Have 10 or more knights in your army
Have 10 or more healers in your army
Have a level 4 vampire in your army
Defeated Sudogar the Sorcerer
Achieve a total score of 5000
Win vs AI Players on Easy difficulty on any map
Construct 4 types of towers in one circle
Win Full Conquest mode on Normal difficulty on any map
Have a max level goblin in your army
Own your first dragon
Own 9 banks
Have a vampire in your army
Get a maximum size haunted pumpkin. Can only be unlocked during the spoooookiest time of the year.
Attain the rank of Healer
Achieve a total score of 1000
Defeated Maugor the Monster
Amass 10 000 food