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.
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.
Visit 50 areas.
Unlock 35 items from Lugh's information shop.
Knock down 3 GuBee's kings.
Release the witch's outfit.
Release all outfits.
Release the ninja outfit.
Release the spearman outfit.
Release the cook's outfit.
Defeat the GuBee's King.
Knock down 20 boss-level monsters.
Unlock 21 items from Lugh's information shop.
Maximum damage exceeds 99999.
Increase the adventurer level to 200.
Increase the adventurer level to 300.
Maximum damage exceeds 9999.
Activate the game for 15 minutes.
Visit 25 areas.
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.
Unlock 7 items from Lugh's information shop.
Start endless mode
Increase the adventurer level to 100.
Complete the story
Discovering the Forgotten Forgotten capital.
Release the guardians of the Forgotten metropolis.
Informed Shiro what you want.
Defeat the cave boss.
Go into fever mode 10 times.
Knock down 50 monsters.
Encounter the researcher in the cave.
Strike 300 times.
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.