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