Grab the Bottle

This is not a cumulative total, and unfortunately the "boss" levels don't count. You need to stretch at least 50 meters in a single normal level, but you DON'T need to complete it. As soon as you've stretched far enough the achievement will immediately unlock in the middle of the level.

Because of this, what you need for this achievement is a big open level with a few blue items to grab. You'll want to cover as much of the screen as possible, grab an item to retract all the way, then again cover the screen and grab the next item, repeating until the achievement unlocks.

I did this in level 34. There are lots of blue items you need to use and a decent amount of room to maneuver. Just follow the video solution but instead of going directly to each blue item, take a very roundabout route to the item to add as much length to your arm as possible.

Level 25 is also good for this. There are five blue items to pick up, but you will have to weave around some platforms. You can follow the normal level solution, just make sure to make extra long unnecessary stretches before grabbing each item, and then make sure you always retract all the way with each one that doesn't need to be dropped on a red piece.