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