Below is a list of all the achievements.

Note that parenthesis note that there are multiple achievements with different thresholds.

For the Archmage achievements, they can be done in a Single Duel Arch Duel, Single Duel vs Archmage difficulty, or Custom deck vs Archmage difficulty.

General

• Take damage from opponents in any play (3,000 / 10,000)
• Deal damage to opponents in any play (3,000 / 10,000)

Duels Against Archmage

• In a row, defeat Archmage in a Single duel (5 / 10)
• Opponent has 6 unblocked creatures
• You have 6 unblocked creatures
• Win a game without ever casting a card which cost less than 3 mana
• Have 150 life
• Accumulate 12 mana of your specialty
• Pass 10 turns in a game
• Lose 30 creatures in a game
• Destroy 30 creatures in a game
• Heal 50 points of damage to your creatures in a single game
• Have an elemental in play with a power 30 or more
• Lose a game where the opponent has less than 5 life remaining
• Win a game with less than 5 life remaining
• Win a game without using any Fire cards
• Win a game without using any Water cards
• Win a game without using any Air cards
• Win a game without using any Earth cards
• Cast 5 Lightning Bolts in a single game
• Cast 4 Stone Rains in a single game
• Have 4 Phoenix in play
• Summon 10 Sea Sprites in a game
• Summon 3 Dragons in a single game
• Summon 3 Wall of Lightnings in a duel
• Summon Astral guard in a duel
• Summon Mind Master in a duel
• Summon 4 Goblin Berserker in a duel
• Summon 5 Wall of fires in a duel
• Summon 5 Elven Healers in a duel

Campaign Rewards

• Defeat Campaign as Cleric (Any / Very Hard)
• Defeat Campaign as Necromancer (Any / Very Hard)
• Defeat Campaign as Mechanician (Any / Very Hard)
• Defeat Campaign as Dominator (Any / Very Hard)
• Defeat Campaign as Chaosmaster (Any / Very Hard)
• Defeat Campaign as Illusionist (Any / Very Hard)
• Defeat Campaign as Demonologist (Any / Very Hard)
• Defeat Campaign as Sorcerer (Any / Very Hard)
• Defeat Campaign as Beastmaster (Any / Very Hard)
• Defeat Campaign as Goblin Chieftain (Any / Very Hard)
• Defeat Campaign as Mad Hermit (Any / Very Hard)
• Defeat Campaign as Chronomancer (Any / Very Hard)
• Defeat Campaign as Warrior Priest (Any / Very Hard)
• Defeat Campaign as Vampire Lord (Any / Very Hard)
• Defeat Campaign as Cultist (Any / Very Hard)
• Defeat Campaign as Golem Master (Any / Very Hard)

League Rewards

• Defeat League as Cleric
• Defeat League as Necromancer
• Defeat League as Mechanician
• Defeat League as Dominator
• Defeat League as Chaosmaster
• Defeat League as Illusionist
• Defeat League as Demonologist
• Defeat League as Sorcerer
• Defeat League as Beastmaster
• Defeat League as Goblin Chieftain
• Defeat League as Mad Hermit
• Defeat League as Chronomancer
• Defeat League as Warrior Priest
• Defeat League as Vampire Lord
• Defeat League as Cultist
• Defeat League as Golem Master