Here is the full list of all 38 A Hole New World achievements.
Get Ice Fire Potion
Defeat Firhaz and sustain no damage
Get Thunder Potion
Find all Stage 2 NPCs
Get Fäy
Kill all the monsters in any Stage
Earn an extra life by achieving a score of 10,000
Fall to Reversee
Get Blood Potion
Get to the last checkpoint in Stage 5
Defeat Prius
Get the Darkness Gemstone
Find all Stage 1 NPCs
Find all Stage 3 NPCs
Find all Stage 4 NPCs
Find all Stage 5 NPCs
Don't kill any monsters in any Stage
Defeat Prius and sustain no damage
Defeat Arcadio and sustain no damage
Defeat the door guardians and sustain no damage
Defeat Dh'raza and sustain no damage
Defeat Prius in Stage 5 and sustain no damage
Defeat Lord Baduk and sustain no damage
Defeat Super Baduk and sustain no damage
Defeat Lord Baduk in Stage 1
Complete Boss Rush Mode
Complete Challenge Mode
Find the secret banana
Get alchemist's heart
Get eternal life
Complete the game in under 35 minutes
Complete Story Mode +
Complete Story Mode
Complete Story Mode with no continues
Complete the game finding all secret characters, secret items and gems
Complete the game killing no enemies at all
Complete the game and kill all the enemies
Unlock all achievements