Left 4 Dead

I'm not positive, nor do I know if this is the case with yours or not, but you have to be online with 4 vs 4 I THINK. I had a few of my friends over when it came out (only 4 of us) and I should have gotten Slippery Pull at least but it didn't unlock so I think either it has to be a game over live or you just need 8 people.

I too have met the requirements of the achievements and I haven't gotten them either, I believe there may be some sort of glitch that I'm hoping Valve will work out sooner or later, it's odd on how some of my friends got Slippery Pull and I didn't and I got Jumin' Jack Smash and my friends can't for some reason. It's weird I know, but like I said, hopefully Valve will fix it if there is a problem.

Are you sure it was 25 health?
and yeah slippery pull was glitched for my friend as well, i have never encountered this problems though :/

I got them all!

www.Left4DeadSafeRoom.com

By the way jumping jack smash (25 damage pounce) does not mean "do 25 damage to a pounced survivor"

it means do a 25 damage pounce...

meaning you have to jump from a very high place, or a moderately high place with a long distance jump....

when you land on the person it must say "You pounced so&so for 25 damage"

it is meant to be a test of skill as a hunter, i am an avid fan of high pounces :-)
with a little bit of practice you can do devastating pounces, even on groups in corners that are otherwise very difficult to touch...

Detailed guides for all Crash Course Achievements can be found here...

www.Left4DeadSafeRoom.com

You can get them all offline. So grab a second contoller, put one one on each team. Back all the survivors up into a corner on the finale, after you jump into the last area, and as the tank, smash that car into them. Do this 5 times and you'll get Smash Hit.