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