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