Here is the full list of all 22 Bardbarian achievements. It takes around 10-12 hours to unlock all of the achievements on Windows.
Do all the things! 100% Completion.
Waltz into Wave 10 and rescue him from that Fire Golem.
Fact: There are 1609 meters in a mile.
Complete the entire campaign from start to finish without dying.
Complete the "evening" chapter.
Complete the "noon" chapter.
Go as fast as you possibly can. (Hint: Upgrade + Song)
Unlock the mythical 4th party slot.
Last for 3 minutes in survival mode.
Reach 3000m in Escape mode, and he's yours.
Play and submit your best time for Survival Mode.
Appears randomly in Survival mode. May luck be with you.
Upgrade a unit to MAX level.
Send 2500 enemies to their grave.
Complete the "night" chapter.
Post a score in the Day 2 Insane Mode leaderboard. The most exclusive of all leaderboards.
Loot 100,000 gold from the corpses of your fallen enemies.
Complete the "morning" chapter.
Don't get hit!
You look lonely, have you considered a pet to keep you company?
Start a new game in Insane Mode.
Something's cooking on the title screen.