Best: Fallout 3. I like the way they look, they have a nice retro vibe.

Worst: Fight Night Round 3. They must have spent countless hours on their design. They all look like this.

Which Achievement images do you think are the best and the worst?

I know it's not 100% what you're asking for but I also hate the generic psn trophies Icon.

Game?

Mass Effect 1 has the best looking achievements imo. 

I don't know what the worst looking one is, but all just go with the Fight night ones also.

Most of the 360's first games had horrible generic looking achievements...in fact in some games all the achievements were exactly the same.

Best one's are Halo Reach's, Fallout and Mass Effect 2.

Best:  Bulletstorm - Armed and Dangerous

Worst: Limbo - Alone in the Dark

Fallout 3's and New Vegas's  are all cool looking and Just Cause 2's are all the same. So that's my worst one. 

Yea the fallout ones are pretty dope and i never liked the ones with one image for all of them.

Winner!

 infamous plat =p