Here is the full list of all 53 Puzzle Quest 2 achievements.
Choose the Bash mini-game whenever possible during the single player campaign
Complete the game without activating an item
Resist Subjugate or Crushing Kill
Lose to an opponent who's on 1 Life Point during any single player game mode
Defeat an opponent while on 1 Life Point during any single player game mode
Watch the credits sequence to the end
Defeat the Green Dragon
Visit every room in the game
Complete the "Insurance Fraud" quest
Defeat an opponent on your first turn during any single player game mode
Defeat the Yeti
Respec your hero by visiting Jarrum Blackstone in the Chapel
Complete the game
Gain access to Gorgons Cathedral
Activate 5 traps during a campaign
Complete the "Deep Delving Dwarf" quest
Heal some trap damage by visiting Jarrum Blackstone in the Chapel
Learn all the bonus spells
Play the "Lucky Dip" side quest
Complete the "Imp!" quest for Crye
Escape the Dark Dwarven Laboratory
Defeat the monster known as "Teh SkullBrekker"
Upgrade an item to Epic
Defeat the Arch Lich
Complete the "Able Replacement" quest
Do more than 250 damage during your turn
Pick your way through 5 locks
Forge the "Hammer of Righteousness"
Complete the "Stuff of Nightmares" quest
Make a match of 8 gems in a row in any battle game mode
Magically force your way through 5 locks
Defeat Shadowbringer
Disarm 5 traps to avoid being wounded
Bash your way through 5 locks
Complete the "Eye of the Owlbear" quest
Search 5 rooms for hidden treasure or danger
Defeat King Godd
Upgrade an item
Clear the town of Goblins.
Be defeated by an opponent on their first turn during single player quest mode
Defeat 500 monsters
Win 5 Tournaments
Survive the Endurance mode
Defeat 5 opponents in multiplayer
Defeat 1000 monsters
Defeat 2000 monsters
Finish the single player campaign with a hero from each class
Finish the single player campaign with both male and female from the one class
Advance to the Green Dragon in Endurance mode on full health
Win a Tournament with the first or second hero alive
Kill an undead monster, then kill it again and again after it reanimates
Lose the burning inn challenge battle
Defeat a Yeti after at least 100 turns have passed