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.
Collect 50 pieces of cheese.
Collect 47 achievement stamps.
Visit 50 areas.
Collect 30 pieces of cheese.
Unlock 35 items from Lugh's information shop.
Knock down 3 GuBee's kings.
Defeat the GuBee's King.
Knock down 20 boss-level monsters.
Release the witch's outfit.
Release all outfits.
Release the ninja outfit.
Release the spearman outfit.
Release the cook's outfit.
Maximum damage exceeds 99999.
Activate the game for 60 minutes.
Unlock 21 items from Lugh's information shop.
Increase the adventurer level to 300.
Collect a cumulative total of 100000 shards of stars.
Increase the adventurer level to 200.
Maximum damage exceeds 9999.
Visit 25 areas.
Collect a cumulative total of 10000 shards of stars.
Knock down 100 monsters.
Increase the adventurer level to 100.
Go into fever mode 10 times.
Collect 23 achievement stamps.
Unlock 7 items from Lugh's information shop.
Start endless mode
Update your high score on the Road to Cheese.
Collect 10 pieces of cheese.
Complete the story
Release the guardians of the Forgotten metropolis.
Informed Shiro what you want.
Activate the game for 30 minutes.
Discovering the Forgotten Forgotten capital.
Defeat the cave boss.
Encounter the researcher in the cave.
Knock down 50 monsters.
Out of the woods.
Activate the game for 15 minutes.
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.
First time in fever state.
Got your first shards of the star.