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