I am on a silly rivalry about this with my brother. Can you recommend me some games with easy achievements?

download this free xbox live game called (dash of destruction its a free 200 gamerscore

Fight Night Round 3.

http://www.xbox360achievements.org/game/fight-night-3/achievements/

8 achievements for 1k

Avatar The Last Airbender: The Burning Earth

1000GS in 2 minutes.

really the easier scores/trophies are basically the ones you get once finishing an level. 

i love when you get a heap when you finish the game like 

-you finished the last level - one trophy 

-you finished the campaign on easy- one trophy

-you finished the campaign on Medium- one trophy 

-you finished the campaign on hard- one trophy

-you finished the campaign. 

Movie games usually have really easy achievements, though that is just what I've heard. I'm a GS whore, but not that big of one. :)

You might be able to look through True Achievements and find the achievements with the lowest TA Ratio (closer to 1, the more people have the achievement, therefore the easier it is to get).

that might be true because I heard the same thing.

Terminator Salvation, I heard that you get everything in 4 hours.

and some hannah montana game, a "walk in the park" for trophies on PS3 (or so I was told).

fight night and tekken are cake and yeah dash of destruction is free.  also one of those avatar games you can get 1000/1000 in like 4 minutes.

http://www.xbox360achievements.org/guides/retail/

this page has guides for most games. It also has the number of acheivemnets per game so look for ones with less per game to get them quickly