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