New Team Fortress 2 Achievements

One Trick Pony
Play 3 rounds as spy while never destroying any objects. Why sap when you can back stab all night?

Blame The Staff
Type "team" and "sucks" into team chat at least five times within a round.

Fire Purty
As pyro, use at least half of your flamethrower ammo without causing any damage.

Back Door Man
Take a control point by yourself while incurring no damage ... because nobody was defending it in the first place.