Originally posted by me here: http://www.drmgamecast.com/2015/04/stealth-inc-2-sore-back-a...
Here's some help to get the elusive "Sore Back" achievement in Stealth Inc 2: A Game of Clones. The level I found it was possible to pull it off on was level 5-X. This is one of the secret test chambers within the game. You can find it in the main game here:
Once you have it unlocked you are able to replay it as many times as you want through the "Test Chambers" option in the main menu.
Anyway, once you have unlocked the level to play follow this video and you will net yourself 50 gamerscore.