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