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