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.
Visit every single place in game.
Spend 9.001 golds.
Earn 9.001 golds.
Play with all classes in game.
Unlock a new master.
Unlock the Hunter class.
Unlock the Knight class.
Use a potion while full health.
Gather 10 grindstones from veins.
Gather a grindstone by mining veins.
Unlock the Bard class.
Unlock the Barbarian class.
Unlock the Game Developers that made the game.
Roll 20 in any random roll.
Clear a dungeon.
Make the blacksmith dance.
Roll 1 in any random roll.
Reach Level 5 in any character.
Win a battle with 7 monsters.
Kill an elite minion.
Unlock the Necromancer class.
Unlock the Shaman class.
Kill a dragon.
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!
Continue the game after a game over.
Complete a campaign using all 5 Game Developers as characters.
Play with all characters in game.
Visit your Kitchen inside the game.
Buy the highest weapon upgrade available.
Buy the highest armor upgrade available.
Reach Level 15 in any character.
Reach Level 30 in any character.
Reach Level 30 in a trio.
Reach Level 30 in every character of your group.
Finished the campaign.
Choose a weird combination of character and class.
Reach Level 15 in a specific Spell.
Unlock all masters.
Finish the storyline as fast as you can (less than 365 days but you may extend that to 465).
Buy all goodies in game.
Clear 10 dungeons.
Clear 50 dungeons.