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