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.
Complete the entire campaign from start to finish without dying.
Send 2500 enemies to their grave.
Go as fast as you possibly can. (Hint: Upgrade + Song)
Post a score in the Day 2 Insane Mode leaderboard. The most exclusive of all leaderboards.
Unlock the mythical 4th party slot.
Complete the "night" chapter.
Complete the "evening" chapter.
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.
Something's cooking on the title screen.
Upgrade a unit to MAX level.
Fact: There are 1609 meters in a mile.
Start a new game in Insane Mode.
Reach 3000m in Escape mode, and he's yours.
Last for 3 minutes in survival mode.
Play and submit your best time for Survival Mode.
Appears randomly in Survival mode. May luck be with you.
Complete the "morning" chapter.
You look lonely, have you considered a pet to keep you company?
Don't get hit!