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