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