Here is the full list of all 31 Barbearian achievements.
Complete the game with 100% completion rating
Defeat Meta Engine
Complete the game
Defeat Master Arbitrator
Compeleted all special quests
All memories unlocked
Wasted perfectly good loot on some boxes
Complete all Master Classes
Unlock all weapon pickups
First Master Class completed
Rescue all trapped minions
Reach maximum chain (999)
Defeat Moo Mobile
Completed all quests at Strange Machinations
Defeat the rhyme blaster, the only true lyrical master
Defeat Ancient Mechanism
Completed all quests at Valley of Bones
Take down 50k enemies
Collect a total of 250k loot
Defeat The Absorber
Completed all quests at Corrupted Forest
Fire a weapon pickup 1k times
Defeat Megaskull
First memory unlocked
Walk 10k
Completed all quests at Skeletal Park
Collect a total of 25k loot
Reach 500 chain
Swing your axe 1k times
Complete the first quest
Free your first minion