The Orange Box

This video shows you how to get this easily.

(The video was priviously broken but it now works - Reported Content edit)

Good luck !

If you use the video like x HeroBlade x said then you are quite safe, BUT sometimes it can happen that you step just slightly on the sand and no antlions will appear as an indicator but you won't get the achievement.

It is much easier to tell if you touched the sand if you are elevated (other indicators are shaking controller or shaking screen), therefore you should use two bed frames that you can jump on. Save after each jump and then take the frame from behind you and place it in front of you.

The two frames can be found here:

1. In the first barn after having used the long plank to cross sand for the first time (Video around 2:50). Shoot it as close to the last rock with a house on it (see 2) with the gravity gun.
2. Inside the last house on the last rock before entering the area with sand only (Video around 3:33).

There are actually three you can use, one's way down on the beach from one of the cliffs, but you can drag it up with the Gravity Gun. Makes it a bit quicker on the end stretch. (Thanks Hurball)

Save regularly! Use the Gravity Gun with planks of wood, palette’s etc to help you get from rock to rock, you should get the achievement before you drop down to fight the queen Antlion.

If you touch the sand slightly and no antlions appear reload as you will not get the achievement.

Very fun and challanging achivement. Once you get past the small little valley and you get to the more open area, go to the buildings and little shacks. They can provide you with ammo and other pieces of wood and debre which is a main priority for this. the easiest solution and the one i chose is to get two long pieces of wood and put one in front of you and then take the one behind you and put it in front of you and then repeat the process until you get to a small piece of land. This process takes a while and can be trouble some at some points so make sure to save a lot and try to take the flattest route possible.

This achievement takes a lot patience to get it without messing up. Be careful when sprinting jumping because when you land you might slide off the rocks.
Use the flat metal sheet,wood plank and crate pieces to get across the sand. making a makeshift bridge out of these 3 things will help you.Make sure you save at the start of the level so just in case the achievement didn't pop up you load your last save point and do it again. But if you mess up on one part you can up load the last auto save(the game makes 2 auto saves)

Our friends at achievement hunters has made a video on how to get this achievement

(Achievement Hunter Community member "Kite_Shugo" shows us how to get this achievement)

(before you give me a "thumbs down" on this or any other solution. Tell what I can do to fix it)

Can't fault the first solution for the route, I tried crossing the big sandy area at the end, using the bed frame, sheets of metal, crates, and all sorts with no success, but I found a neat little add on to the first video! Follow the video to the point where you cross a gap, using oblong wooden boxes to weigh down one end of a see saw type mechanism. Once you have crossed grab them if poss and fire them in the direction you are heading! Use the long plank as before to continue past the buildings, all the while firing the oblong boxes forward to the point where you cross the 50 foot expanse of sand.These boxes proved much easier than the beds, and if you position them carefully, can EASILY walk from one to the next, and cross this last big expanse...I did it first try, after a few attempts at the previous method. Because these boxes are much easier to get on, you dont need to jump, if they are quite close, this prevents those annoying moments where you overshoot and touch the sand. All credit to the previous solutions though, as the route is spot on....happy sand crossing folks!

The way I did it, no offense to the others, is the best way to get this done the first time around as long as you don't screw up before the big area of sand at the end. Get to that big area of sand the same way any video tutorial will show you, but once you near the big lot of sand, start looking for big metal doors where the see-saw is and after that area. I believe there are 2 by the see-saw, one or two by the boat, and one or two in the big sand area, there r five total. also, if you want, you can use little metal doors too so make it more impossible to touch the sand. When you arrive at that shack in the big sand area at the end with the bedframe and stuff in it thats by that generator to turn that tower thing on, instead of going forward like the video tutorial shows you when they use the big plank of wood and such, use your metal doors and go right to the little circular island that has 2-3 stone platforms in between to get there. then once your on top of that island, take your metal doors and drop them down below to the side where your facing the patch of land that will unlock you the achievement. you can jump down to the stone platform nearest you and start placing the doors one by one and make a path leading you all the to the ending land and then use one of the metal doors as a ramp to get up there. then just jump to the higher land before the big antillion and you get the achieve as long as you didnt touch the sand in the beginning. make sure you keep an ear out for rumbles because that will mean u barely touched the sand and you needa reload to a checkpoint that was before you touched the sand. doing this method will make it nearly impossible at the end to touch the sand, thus netting you the achievement. as soon as i figure out how i can make a video of this method, I will.