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