Human Fall Flat

This can be unlocked right at the beginning of the Laboratory level. Walk towards the building and open the door. On the left side you can see the blue orb, take it and walk back to the point you started the level. Look down and throw the orb into the lava.
Easy achievement. 🥳

1:10 Throw Orb in Lava
7:30 Overachiever
17:30 Bullseye

Achievement Walkthrough:

Go to the level "Laboratory"
Then as soon as you get up from falling from the sky, you need to go forward to the room, right in front of you. Then once you see an ball, pick it up and walk out of the room. (With the ball) you need to go near the end (don't jump) you need to throw the orb out into the lava (you can throw with holding the ball with two hands,looking up then looking down, and when you look down you have to let go). In about 5 seconds you pop the acheivement