Here is the full list of all 45 Epic Arena achievements.
Submit 5 turns.
Knock out an enemy unit.
Revive a knocked-out unit.
Knock out 3 or more enemy units in one turn.
Deal 3500 or more damage to an enemy unit or artifact with one single attack.
Kill 3 or more enemy units in one turn.
Knock-out an enemy unit at full health with one shot from an Archer.
Knock out 3 enemy units with one Cyclops attack.
Deal damage to 3 enemy units with one Cyclops attack.
Deal damage to 7 units with one single attack.
Win 5 matches by destroying your opponent's artifacts.
Win 25 matches by eliminating your opponent's units.
Win 50 matches by destroying your opponent's artifacts.
Win 100 matches by eliminating your opponent's units.
Using the Order team, win 10 matches by eliminating your opponent's units.
Using the Chaos team, win 10 games by destroying your opponent's artifacts.
Win a match by eliminating your opponent's units.
Win a match by destroying your opponent's artifacts.
Win a match by destroying your opponent's artifacts without taking damage to your artifacts.
Win 10 matches against Order by destroying your opponent's artifacts, the Dragon Eggs.
Win 10 matches against Chaos by eliminating your opponent's units.
Kill 10 dragons in matches against Order opponents.
Kill 10 Lords of Chaos in matches against Chaos opponents.
Kill 250 enemy units.
Kill 1000 enemy units.
Destroy 100 enemy artifacts.
Win a match by eliminating your opponent's units without losing a single unit.
Win a match by destroying your opponent's artifacts without losing a single unit.
Reach the Adept rank.
Reach the Expert rank.
Reach the Grand Master rank.
Complete the tutorial of the Order team.
Use the Thunder Bolt power card 30 times.
Destroy 5 enemy teleporters.
Use the Barricade power card 50 times.
Use the Resurrection power card 25 times.
Reach the World Champion rank.
Move your Canoneer 5 tiles in one turn
Heal 3 or more friendly units with Doctors healing aura
Knock out 3 or more units with Powder Keg
Knock out 2 full health units with Powder Keg attack
Win 10 games with Pirates by eliminating enemy units
Win 10 games by destroying Pirates Chests
Kill 10 enemy's Captains
Kill enemy Captain with your Captain