Here is the full list of all 11 Orion Sandbox Enhanced achievements.
Kill 500 monsters
Smelt 150 ores
Craft 20 iron items
Mine 3000 blocks
Descent down to planet core
Kill 10 bosses
Grow 30 flower
Find all Bonfires
Find and open all treasures
Make 30 potions
Complete all tasks in The Book of Travels