Here is the full list of all 20 Will Glow the Wisp achievements.
It can move, how amazing!
Impressive, now you only need to do that 56 more times
A new wisp is born!
Sometimes standing still is harder then moving
That was an important milestone in your development
How did you figure that out?
Expanding your horizon
Don't you think killing him went a little to far?
You are realizing that not everything is a game
Becoming a teenager was hard, but you made it
Starting to get along with the other sex
You are feeling ecstatic for having experienced what just happened
It is finally legal for you to make your own bad decisions
You realize how easy it was to be a child
Becoming an adult means understanding that the time for games is over
That was not what I intended
I wanted to create a secret level for this, but a hidden achievement and your pride have to be enough
Okay you won, why I give you an achievement for this escapes me
I was just kidding, you know irony?
Faster than another human being, well he was not that good...