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.
Complete a campaign using all 5 Game Developers as characters.
Play with all characters in game.
Visit your Kitchen inside the game.
Clear 10 dungeons.
Kill a dragon.
Continue the game after a game over.
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.
Play with all classes in game.
Unlock the Shaman class.
Unlock the Necromancer class.
Unlock the Knight class.
Finish the storyline as fast as you can (less than 365 days but you may extend that to 465).
Finished the campaign.
Buy all goodies in game.
Visit every single place in game.
Reach Level 30 in any character.
Reach Level 30 in every character of your group.
Reach Level 30 in a trio.
Earn 9.001 golds.
Unlock all masters.
Use a potion while full health.
Reach Level 15 in a specific Spell.
Unlock a new master.
Buy the highest weapon upgrade available.
Buy the highest armor upgrade available.
Clear a dungeon.
Spend 9.001 golds.
Gather 10 grindstones from veins.
Unlock the Hunter class.
Reach Level 15 in any character.
Roll 20 in any random roll.
Gather a grindstone by mining veins.
Unlock the Barbarian class.
Make the blacksmith dance.
Win a battle with 7 monsters.
Unlock the Bard class.
Unlock the Game Developers that made the game.
Reach Level 5 in any character.
Kill an elite minion.
Roll 1 in any random roll.