Warface

This is another very easy achievement, i think co-op works best for this one however a friend of mine got it while playing versus, To slide you have to hold the left stick to run and press B simultaneously to do a baseball slide, Just fire your gun with RT and kill 5 people whilst sliding!

If you don't have someone to boost this with in a private match a pretty easy place to get it is Initiation Mission: Path A in Co-Op. After you get out of the helicopter and kill the first set of enemies surrounding you there will be a wall in front of you as your next objective. When you walk towards it a bomb will drop making a hole in the wall and enemies will spawn behind it and one on top of a roof, after killing the one on the roof back up and slide towards the enemies in the hole and kill them while sliding. For some reason they will not come through the hole so just rinse and repeat until the achievement is yours.