Here is the full list of all 50 Armello achievements.
Win a game with a Prestige Victory
Win a game with a Prestige Victory on the 9th Day or later.
Win a game with Amber of the Rabbit Clan.
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 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 Spirit Stone Victory.
Win a game of Armello without dying.
Win a game of Armello without killing another Hero.
Kill the same Hero 5 times in a single game.
Kill another Hero in Battle with nothing Equipped and no Followers.
In a single game, receive more than ten Gold from Exploring Dungeons.
Play Reprieve on yourself the same turn you receive a Bounty.
Be presented with a mystical choice.
Win a game with Mercurio of the Rat Clan.
Win a game with a Kingslayer Victory.
Win a game with a Rot Victory.
Kill the King in Battle, without taking any Wounds.
As the Prestige Leader, attack the King.
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 have 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.
In a single game, find two Portals by Exploring Dungeons.
In one turn, Kill a Hero with whom you currently have an Allies' Pact and take one of their Settlements.
Overcome ten Perils in a single game.
In a game, go from being Corrupt to having 0 Rot.
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.
Defeat four or more Kings Guard's in a single game.
Be tricked and trapped by some troublesome lil' fellows.
Be tempted beyond restraint in a Forest.
Be saved by a very helpful fellow, just when you need him most.
Become King or Queen of Armello 50 times.