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.
Secret
Find all the music boxes
Kill 5 enemies with acid
Make the boatman angry
Craft my favourite cap
Open 10 treasure chests
Rescue 10 castaways
Cut 30 bushes
Harpoon dash on a mid-air foe right after air kicking it
A tragic leap of faith