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