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