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