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