Here is the full list of all 33 Cloud Knights achievements.
Survived for 10 minutes in Survival Mode.
Collect three stars in every mission of Chapter Three.
Gain three stars on all missions from 1 to 60.
Caused ten critical hits using a double blade in a single campaign mission.
Caused ten combo hits using a scimitar in a single campaign mission.
Collect three stars in every mission of Chapter Four.
Caused ten combo hits using an axe in a single campaign mission.
Got five separate killstreaks in a single campaign mission.
Collect three stars in every mission of Chapter Two.
Survived for 5 minutes in Survival Mode.
Reached a killstreak of four or more enemies.
Survived for 3 minutes in Survival Mode.
Collect three stars in every mission of Chapter One.
Defeated the Awoken Beast in mission 60.
Defeated the Necromancer Knight in mission 45.
Caused ten critical hits using a scimitar in a single campaign mission.
Won a versus duel after the other player was ahead by two stars.
Won a versus duel 3-0.
Lost a round of a versus duel with full health.
Caused ten combo hits using a double blade in a single campaign mission.
Failed a mission with only one enemy or flaming skull away from victory.
Caused ten critical hits using an axe in a single campaign mission.
Defeated the Undead General in mission 30.
Finished a campaign mission with one of two players dead.
Pushed ten enemies off a platform in a single campaign mission.
Destroyed 50 boxes, barrels or chests in a single campaign mission.
Finished a mission in two player co-op.
Caused ten critical hits using a broad sword in a single campaign mission.
Defeated the Undead Champion in mission 15.
Caused ten combo hits using a broad sword in a single campaign mission.
Finished a mission with all players in full health.
Failed the first mission.
Fell down with full health.