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