What was the last achievement or trophy you got?

[Aphex Demon]

Heat in The Pipe - Get a score of 1,000,000 in Firefight (Halo: Reach)

 

[rockyoumonkeys]

"Clemency Pays" trophy in Red Dead Redemption. Hell, most of the ones I get in the next while will be at the beginning of games, since I'm not that deep into anything I'm playing right now.

 

[chromewarriorXIII]

I got "It's What's Inside That Counts" in Killing Floor. Turn 500 Specimens into giblets.

 

[rockyoumonkeys]

"Insurrection" in Star Wars: Force Unleashed