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