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