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