Here is the full list of all 33 Young Souls achievements.
Complete a dungeon without taking any damage
Collect 100,000 gold
Collect 50,000 gold
Beat Yarlanda in the last Mausoleum
Defeat Dwarvengobben
Finish the game at least in Challenging mode
Help the Professor to bury the Digger under rocks
Rescue the Professor
Complete the game at 100%
Kill Kah-Kon
Kill Shinjo
Kill Dinkoy
Clear all Catacombs
Clear all hard branches
Collect 25,000 gold
Open all gold key chests
Open all silver key chests
Kill Fazmore
Upgrade a weapon to 6 stars
Open all bronze key chests
Ride a dragon for the first time
Upgrade an accessory to its maximum level
Kill Tetcha
Kill Marl
Equip an armor and helmet combo
Upgrade a weapon or armor
Beat Dinkoy
Dodge an attack by rolling
Parry an attack
Block 10 attacks
Kill a goblin for the first time
Earn 5 stars on a Happy Fit training session
Finish the game in Expert mode