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