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