Here is the full list of all 16 Army of Pixels achievements.
Have 100 mana in a game
Revive 5 dead creature with the Raise Dead spell
Play five creature with manadigger trait
Win a game in 5 turns
Have 100 gold in the game
Win a game
Win a game only with Tier 1 minions
Your minion dodge 3 times in a row
Win 100 games
Unlit the torches on the menu screen
Kill a plant with a zombie
Complete all quests
A battle between an angel and a demon
Play five creature with golddigger trait
Kill an enemy Tier 3 minion with rats
Cast Turn to Bat spell on a bat