Here is the full list of all 42 Knights of Pen and Paper +1 achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Clear 50 dungeons.
Visit your Kitchen inside the game.
Kill a dragon.
Continue the game after a game over.
Clear 10 dungeons.
Buy the highest weapon upgrade available.
We know it may be frustrating to die so we've just rewarded you with this achievement. Do not give up, the game is about to begin!
Choose a weird combination of character and class.
Complete a campaign using all 5 Game Developers as characters.
Finished the campaign.
Buy the highest armor upgrade available.
Reach Level 30 in every character of your group.
Buy all goodies in game.
Play with all characters in game.
Unlock all masters.
Play with all classes in game.
Unlock a new master.
Clear a dungeon.
Visit every single place in game.
Gather 10 grindstones from veins.
Reach Level 30 in any character.
Unlock the Shaman class.
Win a battle with 7 monsters.
Spend 9.001 golds.
Gather a grindstone by mining veins.
Earn 9.001 golds.
Unlock the Necromancer class.
Reach Level 30 in a trio.
Unlock the Hunter class.
Unlock the Knight class.
Reach Level 15 in a specific Spell.
Unlock the Bard class.
Unlock the Barbarian class.
Use a potion while full health.
Reach Level 15 in any character.
Make the blacksmith dance.
Unlock the Game Developers that made the game.
Roll 20 in any random roll.
Roll 1 in any random roll.
Reach Level 5 in any character.
Kill an elite minion.
Finish the storyline as fast as you can (less than 365 days but you may extend that to 465).