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