Here is the full list of all 50 Batbarian: Testament of the Primordials achievements.
Loot 100% of the chests
Find all gems
Trick the imps
Carefully beat a boss without getting hit
Complete the puzzle piece and arena goblet trophies in Forgotten Roots
Save Friffle and his kids
Beat the game (Ending A)
Unlock all bestiary entries
Find all the maps
Beat the game (Ending B)
Defeat Lamara
Defeat the demon Vorga
Defeat Drai Lez after his betrayal
Collect 3 stone fragments
Recover the ghost's memory
Beat the game (Ending C)
Have Rowr join the team
Get Friffle's kid's name right
Discover the truth
Defeat the pesky ghost for real this time
Get all heart upgrades
Defeat Cobalt
Defeat the Ogre Leader
Reach the ogre fortress factory's entrance without being caught once.
Bribe your way in twice
Collect 10 awareness potions
Collect 10 Ogre draughts
Pip is frozen now...
Defeat the Goddess and her undead servant
Collect 10 iron skin potions
Have Pip do an elemental strike on an enemy weak to it
Discover the Ethereal Palace...
Carry 30 stones
Kill the drakin
Find 25 gems
Find 10 upgrade satchels
Pip is on fire
Find 10 gems
Hit that annoying lever
Trust Twigs to join your team
Defeat the three headed lich in the ruins
Get the dash boots and the power ring
Oops. A short lived companionship.
Defeat the quivering ancient
Have Drai Lez join the team
Read something in the dungeon
Spare the drakin
Never miss a chance to say you hate magic
Reach the final boss and escape the cave victorious in under 3 hours
Reach the final boss and escape the cave victorious without dying