The easiest way to do this is to play on Deathmatch free-for-all, as you'll have plenty of targets to take out. Plus, if you play against bots, then any reasonably skilled human player will be able to get the kills easily. Once you've got the kill, just play out the match until the end and you'll get the achievement.

It's a highly optimized game that can run on a wide range of hardware, but you'll still need to tweak some graphics settings if you want a competitive frame rate.

Quickswitching is important for snipers in CS2 because it helps them avoid the delay of the scope animation, enabling them to be ready for the next action more quickly.