I personally love this game. I enjoyed the last one too, hard evidence and have to say this one was better written and more fun to play.
Achievements come very easily in this game but you can miss some if you rush through it. Each case gives you an opportunity to get one of the 9 skill, cunning, or thoroughness achievements. If done right you can get all 9 in any of the 5 cases. Also each case give you an opportunity to get a "fun" achievement by doing something specific with each case and also a bonus achievement by helping out a fellow CSI with their investigation. You also get one for completing each case. There are some random ones too, like viewing a video in the case file or looking at the options menu.
All in all, the game seems to use the same engine as the last one but a little better polished. You no longer have to go though the tediousness of using the tweezers or gloves to collect things, but its now automatic once you find evidence. Also you don't have to click on the camera to use it, but it is automated as well. They have streamlined a lot of the collection process which is very awesome how they did it. They actually split the lab into two parts now and made it a lot more fun.
It is nice to see cast back for this game, except for Rilley which I could do without anyway. I didn't like her in the show and am glad she is gone but wish they hadn't put her in the game, instead they should have put Sara in it since she is back on the show.
So if you are a CSI fan and love the show this game is for you. If you need help with any of the achievements check out the solutions I have left you for most or all of them.