Here is the full list of all 39 Imagine Lifetimes achievements.
You successfully died of old age.
You perished in pursuit of perfection.
You ran out of health.
You completed the circle of life.
You found out the struggle is real.
You crossed the line.
You recognized your insignificance.
You were struck by lightning.
You chose not to make a choice.
You took a risk.
You were never forgotten.
You questioned your reality.
You triggered the apocalypse.
You created a game within a game.
You reached your terminal velocity.
You got comfortable.
You prevented this ending.
You have earned yourself a clean slate.
You unlocked the meaning of life.
You embraced your reality.
You were born.
You unlocked your imagination.
You entered an alternate reality.
You entered the door on your left.
You broke the pencil.
You collected a lot of purpose.
You wallowed in nothingness.
You pretended to be in control.
You deleted your marriage.
You survived.
You retired from a life of crime.
You went missing.
You consumed the world.
You endured the tutorial.
You got away with it.
You barely lifted a finger.
You did it yourself.
You pinched the pennies.
You changed every channel.