Counter-Strike: Source achievements

Get two kills standing in the same spot with a zoomed sniper rifle.

Be the last player alive in a round (with at least 5 players on your team)

Kill two enemy players with a single bullet

Dominate three enemy players simultaneously

Win 5 Pistol Rounds

Inflict 50,000 total points of damage to enemy players

Kill an airborne enemy

Take 80 points of damage from enemy grenades and still survive the round

Win a round by defusing a bomb

Get kills with 5 different guns in a round

Kill an enemy player 4 additional times while you are dominating them

Kill an enemy player in the same round as they kill a player on your friends list