Here is the full list of all 30 Eastward achievements.
Eat every food item in the game.
Complete the game.
Reach max hearts.
Open all the treasure boxes in the game.
Complete Chapter 7.
Upgrade all weapons to their max levels.
Collect every single Pixball.
Collect at least 1 of every type of Pixball.
Collect every recipe in the game.
Collect every ingredient in the game.
Upgrade your backpack to its maximum capacity.
Complete the true ending in Earth Born.
Try all five jobs with John.
Complete Chapter 6.
Complete Chapter 5.
Upgrade your bomb and ammo boxes to their maximum capacities.
Complete Chapter 4.
Complete Chapter 3.
Obtain 1,000 salt from off a Salt Bug.
Obtain a "heart" from the people of New Dam City.
Learn all of Sam's abilities.
Interact with 100 different NPCs.
Interact with 50 different NPCs.
Complete Chapter 2.
Complete Chapter 1.
Defeat an enemy while it's being controlled by Sam.
Defeat an enemy using clutter from off the ground.
Cook your first dish.
Defeat the Demon King in Earth Born.
Obtain a Pixball.