Here is the full list of all 10 Olija achievements worth 1,000 gamerscore. It takes around 4-5 hours to unlock all of the achievements on Xbox One.
Escape Terraphage
A tragic leap of faith
Rescue 10 castaways
Find all the music boxes
Open 10 treasure chests
Kill 5 enemies with acid
Craft my favourite cap
Harpoon dash on a mid-air foe right after air kicking it
Cut 30 bushes
Make the boatman angry