When one of these creatures is nearby, it will be marked on the mini-map. Volatiles are very fast, do massive damage, and have 3000 health.
They spawn very frequently around the Tower (safe zone in the Slums where the game begins and where most main missions start).
Easy "Harran Athletics" achievement This can be done in single player mode if you have the "Cuisine & Cargo" DLC.
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Next, have the invited player force close the game to avoid saving his or her inventory.
Invite a player back into your game, and repeat the process a few more times.
Easy "Italian Plumber" achievement First, buy the "Vault" (Agility Level 4) and "Drop Attack" (Power Level 10) skills. Wrenches can be found randomly all over the game world (mostly in the early game). If you find one early in the game, keep it for this achievement.
Then, equip a wrench, run towards an enemy, vault over them, and use a weapon attack while in the air to get the "Italian Plumber" achievement. If you cannot find a wrench, ask another player for one.