Here is the full list of all 47 ONE PUNCH MAN: A HERO NOBODY KNOWS achievements.
Obtain 150 or more avatar parts (accessories excluded).
Clear Chapter 10.
Clear Chapter 9.
Clear 100 or more missions.
Deepen bonds with ten heroes.
Clear Chapter 8.
Get promoted to Hero Rank Class A.
Clear 30 or more subquests (tutorial excluded).
Use a boost item for the first time.
Obtain 50 or more pieces of furniture.
Clear Chapter 7.
Deepen bonds with five heroes.
Reach the max level for the machine battle type.
Clear Chapter 6.
Obtain 30 or more Killer Moves.
Clear Chapter 5.
Reach the max level for the psychic battle type.
Deepen bonds with a hero.
Reach the max level for the power battle type.
Clear Chapter 4.
Reach the max level for the weapon battle type.
Equip a Super Killer Move and use it in battle (tutorial excluded).
Clear Chapter 3.
Unlock more than 15 characters for Free Battles with Team Rules.
Place furniture in your room for the first time.
Make a purchase for the first time.
Get promoted to Hero Rank Class B.
Reach the max level for the standard battle type.
Equip a skill for the first time.
Clear Chapter 2.
Change your outfit for the first time.
Clear a mission from Hero Association HQ for the first time.
Perform a Mode Change in battle for the first time (tutorial excluded).
Perform a perfect guard in battle for the first time (tutorial excluded).
Set a Killer Move for the first time.
Clear a subquest for the first time (tutorial excluded).
Land the first attack in battle for the first time (tutorial excluded).
Clear a mission from a Hero Association branch office for the first time (tutorial excluded).
Clear Chapter 1.
Increase your Player Level.
Earn every trophy.
Clear Chapter 11.
Get promoted to Hero Rank Class S.
Reach the max level for the monster battle type.
Obtain 30 or more skills.
Reach Player Level 50.
Reach the maximum Player Level.