Lara Croft: Relic Run

You have two options for getting this achievement. Play through Infinite Mode and just keep running and jumping, or play a level where you need to find Relic Clues and AVOID the clues, so you keep running in that level. You need to jump/hurdle over twenty gaps or obstacles for this. It's best to stock up on revive Ankhs (bring you back to life) for this one.