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