You get this Achievement when you finish the game. Some puzzles may go right over your head and you have no idea what to do so i'm going to show you all a video I watched when I was stuck. It helped me out a lot so I hope it does the same for you.
The Achievement will pop when you finish the game and the credits are over!
Have a look through these solutions to get these Achievements on the way.
The Going Up achievement in LIMBO worth 143 pointsDon't let gravity keep you down The first video is a game walk through of the entire game and the second video is all the eggs.
Have fun :).