Here is the full list of all 28 The Eyes of Ara achievements.
Find a way into the Pumpkin Lord's Tomb during the Haunted Halloween seasonal event.
Extinguish all of the blue Jack-'o-Lanterns during the Haunted Halloween seasonal event.
Discover an odd star formation using the telescope
Read each of the Backer's Books
Find Mike's lost coin collection
Locate the Backer's Gallery Secret Room
Spend 5 minutes stargazing in the Planetarium
Reunite Alexander's lost action figures
Find Astra's missing paintings
Assemble Clementine's scattered photo album
Collect Christopher's scattered coin collection
Locate the Mountain Bräu Brewery
Find all of the children's letters to Santa during the Merry Mysteries seasonal event
Open the gift during the Merry Mysteries seasonal event
Read each copy of Christopher's favourite book
Locate Baron Contington's Hidden Trophy Room
Complete the Epilogue
Turn off all of the Radios
Unlock the door to the Altar of Night
Read each of Christopher's journals, Clementine's scattered journal pages, and Astra's notes
Locate Lady Catherine's Secret Room
Read each copy of "The Edge of Infinity" and all "Wonders of Space" posters
Complete Chapter 3
Loot the treasure horde
Complete Chapter 2
Complete Chapter 1
Find your first Blue Orb
Complete the Tutorial