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