Here is the full list of all 55 Pixel Heroes: Byte & Magic achievements.
Finish your first quest.
Defeat the boss of the Haunted Mansion.
Enter a bossfight with two alive heroes and be victorious.
Defeat your first enemy.
Unlock a treasure chest with no more than 20% chance.
Evade an attack by the use of Concealed.
Listen to Layment, the travelling musicians.
Survive through 3 dungeons in a row.
Revive 3 fallen heroes during one adventure.
Use 50 potions during one adventure.
Drink 100 glasses of beer during one adventure.
Defeat the boss of the Arcane Armory.
Defeat the boss of The Boneyard.
Defeat the boss of the Byting Woods.
Defeat the boss of the Cyclopean Pyramid.
Defeat the boss of the Randoom Meteorite.
Defeat the boss of the Gates of Ashtur.
Help Mustachio on his path to self-fulfillment.
Help Captain Capslock on his path to self-fulfillment.
Help Sapphire on her path to self-fulfillment.
Help Shroom on his path to self-fulfillment.
Help Jindid on his path to self-fulfillment.
Finish a complete adventure without dying once.
Defeat the captor of souls himself.
Defeat the boss of the Goblin Outpost.
Defeat the boss of the Sunken Empire.
Defeat the boss of the Stormy Peaks.
Defeat the boss of the DevilsReef.
Defeat the boss of Old Volcano.
Defeat the boss of the Ancient Temple.
Lose all your heroes for the first time.
Lose 10 times.
Lose 50 times.
Lose 100 times.
Finish an adventure with an all-Human party.
Finish an adventure with an all-Dwarf party.
Finish an adventure with an all-Skyborn party.
Finish 6 dungeons during one adventure.
Defeat three enemies with one hit.
Defeat an enemy only with the fist.
Uncover the dark secret of the casino owner.
Finish an adventure with Herbalist, Priest and Brewmaster.
Finish an adventure with Fighter, Barbarian and Warrioress.
Finish an adventure with Enchantress, Shadowmancer and Skyweaver.
Solve all four riddles of the enigmatic idols.
Reach 500 HP with one hero.
Defeat the inscrutable flying polyp.
Finish the final campaign without a hero dying.
Listen to all stories of the barkeeper.
Lead all citizens to maximum happiness.
Unlock all hero classes.
Play at least once with each hero class.
Finish an adventure with each hero class.
Escape the red flyswarm 4 times.
Enter a bossfight with a single alive hero and be victorious.