Here is the full list of all 50 Armello achievements worth 1,000 gamerscore. It takes around 40-50 hours to unlock all of the achievements on Xbox One.
Complete Armello's Prologue.
Win a game with Thane of the Wolf Clan.
Win a game with Sana of the Bear Clan.
Win a game with Amber of the Rabbit Clan.
Win a game with Mercurio of the Rat Clan.
Win a game with River of the Wolf Clan.
Win a game with Brun of the Bear Clan.
Win a game with Barnaby of the Rabbit Clan.
Win a game with Zosha of the Rat Clan.
Win a game with a Kingslayer Victory.
Win a game with a Prestige Victory
Win a game with a Rot Victory.
Win a game with a Spirit Stone Victory.
Kill the King in Battle, without taking any Wounds.
Win a game of Armello without dying.
Win a game with a Prestige Victory on the 9th Day or later.
As the Prestige Leader, attack the King.
Win a game of Armello without killing another Hero.
Pierce through 3 Shields with Thane's Hero Power.
Defeat a Corrupted Hero with Sana's Hero Power.
As Amber, have 3 Equipped Treasures and 3 Recruited Followers.
Steal another Hero's last Gold using Mercurio's Hero power.
Annihilate another Hero with Brun's Hero power active.
Make 3 Kills in one Turn using River's Hero power.
As Barnaby, have three Items Equipped and a full Hand of Item Cards.
Finish a game with Zosha having never been revealed at Night.
Have the Spy Glass and Sailor's Lantern Equipped at the same time.
Have your Items grant you six or more Shields in Battle.
Kill 3 King's Guards with a Royal Pardon Equipped.
Find and Equip three Treasures from Dungeons.
Heal a Bane.
Steal the King's Crown in Battle with the Mirror Cape.
Play Lightning Strike to a Hero standing on a Palace Tile.
Kill the same Hero 5 times in a single game.
In a single game, find two Portals by Exploring Dungeons.
In one turn, Kill a Hero you have an Allies' Pact with and take one of their Settlements.
Overcome ten Perils in a single game.
In a game, go from being Corrupt to having 0 Rot.
Kill another Hero in Battle with nothing Equipped and no Followers.
In a single game, receive more than ten Gold from Exploring Dungeons.
Breach the Palace before the 5th Dawn.
Reach 13 Rot or more in a single game.
Regain a Recruited Follower to your Party whom you had already lost that game.
Play Reprieve on yourself the same turn you receive a Bounty.
Defeat four or more King's Guards in a single game.
Be presented with a mystical choice.
Be tricked and trapped by some troublesome lil' fellows.
Be tempted beyond restraint in a Forest.
Be offered the best feel good options in Armello.
Become King or Queen of Armello 50 times.