Feed the cow 5 times.

Inspect all books.

Collect all badges.

Fire a cannonball in the ocean.

Collect all keys.

Play a song.

Collect one key.

Complete the first machine.

Inspect 16 objects.

Stay underwater for a long time.

Collect one badge.

Inspect 8 objects.

Go to the watchtower.

Play all songs.

Inspect a book.

Run for a long time.

Complete the second machine.

You can't escape!

Find Shanes’s Mom Letter.

Complete the third machine.

Find the moon pamphlet.

Find the secret ending.

Escape from the Gideon.

Become an engineer...?