Here is the full list of all 48 The Adventure of NAYU achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Activate the game for 60 minutes.
Collect 47 achievement stamps.
Release all outfits.
Visit 50 areas.
Release the ninja outfit.
Release the witch's outfit.
Release the spearman outfit.
Release the cook's outfit.
Unlock 35 items from Lugh's information shop.
Knock down 3 GuBee's kings.
Knock down 20 boss-level monsters.
Unlock 21 items from Lugh's information shop.
Maximum damage exceeds 99999.
Defeat the GuBee's King.
Increase the adventurer level to 300.
Activate the game for 30 minutes.
Visit 25 areas.
Increase the adventurer level to 200.
Collect a cumulative total of 100000 shards of stars.
Go into fever mode 10 times.
Maximum damage exceeds 9999.
Knock down 100 monsters.
Increase the adventurer level to 100.
Unlock 7 items from Lugh's information shop.
Start endless mode
Collect 23 achievement stamps.
Collect 30 pieces of cheese.
Collect 50 pieces of cheese.
Update your high score on the Road to Cheese.
Collect 10 pieces of cheese.
Release the guardians of the Forgotten metropolis.
Complete the story
Informed Shiro what you want.
Collect a cumulative total of 10000 shards of stars.
Activate the game for 15 minutes.
Defeat the cave boss.
Discovering the Forgotten Forgotten capital.
Encounter the researcher in the cave.
Knock down 50 monsters.
Out of the woods.
Meet Suzu and become friends.
Strike 300 times.
Defeat Rye in the woods.
Defeat Lev in the woods.
Clear the first area of the story.
Defeat the bear in the meadow.
Got your first shards of the star.
First time in fever state.