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