Here is the full list of all 33 LOST EMBER achievements.
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Found all relics
Found all mushrooms
Found a weird triangle-shaped thing
Found the golden Statue
Triggered all memories
Found a weird cube-shaped thing
Find all legendaries
Played all animals.
Found a weird fashion-shaped thing
Damaged over 20 remains from the old days
Found and possessed 3 legendaries
Found 50 relics
Found 70 mushrooms
Played 10 different animals.
Triggered 20 memories
Found 25 relics
Spread spores of each mushroom kind
Found a weird tube-shaped thing
Found 50 mushrooms
Spent a bunch of time underwater
Spent a bunch of time underground
Got through the Flappy Duckling level
Found an odd mini-game
Roll for a mile
Found 30 mushrooms
Triggered 5 memories
Spent a bunch of time in the air
Found a legendary animal
Found a weird... shaped thing
Found 5 relics
Had too many berries
Found a weird sphere-shaped thing