Here is the full list of all 26 Knights of Pen and Paper 3 achievements.
Win a Hard 5v5 battle.
Have all enemies act before you in a 5v5 battle.
Complete the quest Management Feedback.
Kill 10 Goblins.
All current Party Heroes are Dwarfs.
Win a 5v5 battle with one character alive.
Kill 33 Lobster Boxers.
Kill 60 Darts.
Kill 25 Ettins.
Kill 50 Floradogs.
Kill 25 Magical Karps.
Kill 50 Skeletons.
Kill 25 Trolls.
Reach level 10 with a character.
Reach level 20 with a character.
Reach level 100 with a character.
Have 5 characters at max level.
Complete the quest Into the Spire.
Complete the quest This Time We Finish You!
Complete the quest Shuffling Showdown.
Complete the quest Victory!
Complete the quest Furry Menace.
Complete the quest Progress Report.
Complete the quest All Hail the King.
Reach Dark Dungeons level 25.