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