Here is the full list of all 21 Edward's Journey achievements.
Found your first stick
Cast your line for the first time
Save up 5000 jewels
Craft your first weapon or armor
Cook something at a cauldron for the first time
Dig up your first treasure
Take your first steps to find your sister
Solve your first puzzle
Learn a new skill
Kill the giant crab king
Enter a giant worm
Collect your first pet
Complete your first dungeon
Go on a train ride
Crushed the glacier boss
Kill the goliath spider boss
Combine all four crystal shards
Create the gold-plated snake stick
Collect the frog king's helm
Kill the splitface holding your sister
Return your sister to her gram