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