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