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