Here is the full list of all 49 Nights of Azure achievements.
Summoned Servans 1000 times.
Actualized 80 Servans.
Cleared half of Arena tasks.
Executed trades all over the world.
Defeated Christophorus.
Transformed into Nightmare form.
Collected all Servans.
Defeated Mistral.
Arnice equipped Hamelin's Pipe and cleared a battle.
Arnice equipped Glass Blade and cleared a battle.
Arnice achieved her max level.
Actualized 40 Servans.
Viewed an ending.
Defeated Ludegert.
Achieved 500-Chain.
Executed trades in half of the world.
Transformed into Rabbit form.
Maxed out a Servan's level.
Defeated Corrine.
Gave 1000 orders to Servans.
Transformed into Phantom form.
Transformed into Armor form.
Defeated Blueblood Dragon Mavelus.
Collected 50% of items.
Defeated Blueblood Maiden Milaya.
Executed a trade for the first time.
Collected 50% of Servans.
Defeated Blueblood Count Rosier.
Achieved 300-Chain.
Summoned a Servan 100 times.
Defeated 1,000 enemies.
Defeated Blueblood Cavalry Carousel.
Gave 100 orders to Servans.
Cleared first Arena task.
Completed first task.
Defeated Blueblood Dragon.
Transformed into Demon form.
Achieved 100-Chain.
Actualized a Servan for the first time.
Defeated 100 enemies.
Gave an order to a Servan for the first time.
Summoned a Servan for the first time.
Collected all achievements.
Viewed an extra ending.
Completed 100 tasks.
Completed 300 tasks.
Cleared all Arena tasks.
Collected all items.
Defeated 10,000 enemies.