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