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.
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 entire campaign from start to finish without dying.
Complete the "night" chapter.
Something's cooking on the title screen.
Complete the "evening" chapter.
Loot 100,000 gold from the corpses of your fallen enemies.
Fact: There are 1609 meters in a mile.
Send 2500 enemies to their grave.
Complete the "noon" chapter.
Waltz into Wave 10 and rescue him from that Fire Golem.
Upgrade a unit to MAX level.
Reach 3000m in Escape mode, and he's yours.
Appears randomly in Survival mode. May luck be with you.
Last for 3 minutes in survival mode.
Play and submit your best time for Survival Mode.
Don't get hit!
You look lonely, have you considered a pet to keep you company?
Complete the "morning" chapter.