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