Here is the full list of all 21 AER - Memories of Old trophies - there are 14 silver, 6 gold and 1 platinum.
Explore the Land of Gods.
Complete the game.
Discover all areas of the map.
Complete the The Monastery.
Find the Ancient Llamba.
Complete the The Archives.
Speak to all of the spirit animals.
Find the bones of an old beast.
Find the dwellings of the rift cult.
Find the ancient battlefield.
Find the giant birdshrine.
Find the chiseled stone map.
Find the statue of the fox.
Find the statue of the crane.
Find Erin when she's gone.
Complete the Eventide Sanctuary.
Step into the well.
Find the Crab Island.
Find the statue of the deer.
Get some Lambaby love.
Escape the collapsing cave.