Easy game to get achievements?

Anyone want to suggest an easy game to bring up the Gamerscores for everyone?

I got Sonic the Hedgehog 3 from the Marketplace and I got all the achievements in less than 2 hours. (I also finally figured out how to beat the level I've been stuck on for 15 years. It was so simple that I felt ashamed to call myself a Sonic gamer. :sad:)

play through the COD campaigns on veteran, you'll rack up some gamerscore pretty quick.

Theres a Game On the Market Place Called Dinosour Rush Or Sumthin
Its Made by Doritos,
All Achievements Put together are 200gs

Chronicles of Riddick has like 50 achievements and isn't too hard. That and mercenaries 2

Theres Also that Avatar Game,THeres 5 Achievements That Add up to 1000
There like Get a hit Combo,

you can get 1000/1000 in fight night round 3 in one sitting

You can get 1000 gamerscore easily on these games:

Avatar: the last airbender
King Kong
Lost: Via Domus
CoD Modern Warfare (as long as you can do the mile high club achievement)